diff --git a/protocol/src/admin.rs b/protocol/src/admin.rs
index 614ffb2..69bc835 100644
--- a/protocol/src/admin.rs
+++ b/protocol/src/admin.rs
@@ -1,20 +1,28 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
+//! Admin packets.
+
 use crate::cursor::{Cursor, CursorMut};
 use crate::types::Hide;
 use crate::Error;
 
+/// Default hash length.
 pub const HASH_LEN: usize = 64;
+/// Default hash key.
 pub const HASH_KEY: &str = "Half-Life";
+/// Default hash personality.
 pub const HASH_PERSONAL: &str = "Freeman";
 
+/// Admin challenge request.
 #[derive(Clone, Debug, PartialEq)]
 pub struct AdminChallenge;
 
 impl AdminChallenge {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"adminchallenge";
 
+    /// Decode packet from `src`.
     pub fn decode(src: &[u8]) -> Result<Self, Error> {
         if src == Self::HEADER {
             Ok(Self)
@@ -23,21 +31,28 @@ impl AdminChallenge {
         }
     }
 
+    /// Encode packet to `buf`.
     pub fn encode(&self, buf: &mut [u8]) -> Result<usize, Error> {
         Ok(CursorMut::new(buf).put_bytes(Self::HEADER)?.pos())
     }
 }
 
+/// Admin command.
 #[derive(Clone, Debug, PartialEq)]
 pub struct AdminCommand<'a> {
+    /// A number received in admin challenge response.
     pub master_challenge: u32,
+    /// A password hash mixed with a challenge number received in admin challenge response.
     pub hash: Hide<&'a [u8]>,
+    /// A command to execute on a master server.
     pub command: &'a str,
 }
 
 impl<'a> AdminCommand<'a> {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"admin";
 
+    /// Creates a new `AdminCommand`.
     pub fn new(master_challenge: u32, hash: &'a [u8], command: &'a str) -> Self {
         Self {
             master_challenge,
@@ -46,6 +61,7 @@ impl<'a> AdminCommand<'a> {
         }
     }
 
+    /// Decode packet from `src` with specified hash length.
     pub fn decode_with_hash_len(hash_len: usize, src: &'a [u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(Self::HEADER)?;
@@ -60,11 +76,13 @@ impl<'a> AdminCommand<'a> {
         })
     }
 
+    /// Decode packet from `src`.
     #[inline]
     pub fn decode(src: &'a [u8]) -> Result<Self, Error> {
         Self::decode_with_hash_len(HASH_LEN, src)
     }
 
+    /// Encode packet to `buf`.
     pub fn encode(&self, buf: &mut [u8]) -> Result<usize, Error> {
         Ok(CursorMut::new(buf)
             .put_bytes(Self::HEADER)?
@@ -75,13 +93,17 @@ impl<'a> AdminCommand<'a> {
     }
 }
 
+/// Admin packet.
 #[derive(Clone, Debug, PartialEq)]
 pub enum Packet<'a> {
+    /// Admin challenge request.
     AdminChallenge(AdminChallenge),
+    /// Admin command.
     AdminCommand(AdminCommand<'a>),
 }
 
 impl<'a> Packet<'a> {
+    /// Decode packet from `src` with specified hash length.
     pub fn decode(hash_len: usize, src: &'a [u8]) -> Result<Self, Error> {
         if let Ok(p) = AdminChallenge::decode(src) {
             return Ok(Self::AdminChallenge(p));
diff --git a/protocol/src/color.rs b/protocol/src/color.rs
index 5ad5146..0a30930 100644
--- a/protocol/src/color.rs
+++ b/protocol/src/color.rs
@@ -1,17 +1,28 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
+//! Color codes for strings.
+
 use std::borrow::Cow;
 
+/// Color codes `^digit`.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub enum Color {
+    /// Black is coded as `^0`.
     Black,
+    /// Red is coded as `^1`.
     Red,
+    /// Green is coded as `^2`.
     Green,
+    /// Yellow is coded as `^3`.
     Yellow,
+    /// Blue is coded as `^4`.
     Blue,
+    /// Cyan is coded as `^5`.
     Cyan,
+    /// Magenta is coded as `^6`.
     Magenta,
+    /// White is coded as `^7`.
     White,
 }
 
@@ -33,11 +44,29 @@ impl TryFrom<&str> for Color {
     }
 }
 
+/// Test if string starts with color code.
+///
+/// # Examples
+/// ```rust
+/// # use xash3d_protocol::color::is_color_code;
+/// assert_eq!(is_color_code("hello"), false);
+/// assert_eq!(is_color_code("^4blue ocean"), true);
+/// ```
 #[inline]
 pub fn is_color_code(s: &str) -> bool {
     matches!(s.as_bytes(), [b'^', c, ..] if c.is_ascii_digit())
 }
 
+/// Trim color codes from a start of string.
+///
+/// # Examples
+///
+/// ```rust
+/// # use xash3d_protocol::color::trim_start_color;
+/// assert_eq!(trim_start_color("hello"), ("", "hello"));
+/// assert_eq!(trim_start_color("^1red apple"), ("^1", "red apple"));
+/// assert_eq!(trim_start_color("^1^2^3yellow roof"), ("^3", "yellow roof"));
+/// ```
 #[inline]
 pub fn trim_start_color(s: &str) -> (&str, &str) {
     let mut n = 0;
@@ -51,11 +80,25 @@ pub fn trim_start_color(s: &str) -> (&str, &str) {
     }
 }
 
+/// Iterator for colored parts of a string.
+///
+/// # Examples
+///
+/// ```rust
+/// # use xash3d_protocol::color::ColorIter;
+/// let colored = "^1red flower^7 and ^2green grass";
+/// let mut iter = ColorIter::new(colored);
+/// assert_eq!(iter.next(), Some(("^1", "red flower")));
+/// assert_eq!(iter.next(), Some(("^7", " and ")));
+/// assert_eq!(iter.next(), Some(("^2", "green grass")));
+/// assert_eq!(iter.next(), None);
+/// ```
 pub struct ColorIter<'a> {
     inner: &'a str,
 }
 
 impl<'a> ColorIter<'a> {
+    /// Creates a new `ColorIter`.
     pub fn new(inner: &'a str) -> Self {
         Self { inner }
     }
@@ -80,6 +123,14 @@ impl<'a> Iterator for ColorIter<'a> {
     }
 }
 
+/// Trim color codes from a string.
+///
+/// # Examples
+///
+/// ```rust
+/// # use xash3d_protocol::color::trim_color;
+/// assert_eq!(trim_color("^1no^7 ^2colors^7"), "no colors");
+/// ```
 pub fn trim_color(s: &str) -> Cow<'_, str> {
     let (_, s) = trim_start_color(s);
     if !s.chars().any(|c| c == '^') {
diff --git a/protocol/src/filter.rs b/protocol/src/filter.rs
index e5e2b50..ddc816f 100644
--- a/protocol/src/filter.rs
+++ b/protocol/src/filter.rs
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
-//! Server query filter
+//! Server query filter.
 //!
 //! # Supported filters:
 //!
@@ -43,6 +43,7 @@ use crate::types::Str;
 use crate::{Error, ServerInfo};
 
 bitflags! {
+    /// Additional filter flags.
     #[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
     pub struct FilterFlags: u16 {
         /// Servers running dedicated
@@ -84,18 +85,24 @@ impl<T> From<&ServerAdd<T>> for FilterFlags {
     }
 }
 
+/// Client or server version.
 #[derive(Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord)]
 pub struct Version {
+    /// MAJOR version.
     pub major: u8,
+    /// MINOR version.
     pub minor: u8,
+    /// PATCH version.
     pub patch: u8,
 }
 
 impl Version {
+    /// Creates a new `Version`.
     pub const fn new(major: u8, minor: u8) -> Self {
         Self::with_patch(major, minor, 0)
     }
 
+    /// Creates a new `Version` with the specified `patch` version.
     pub const fn with_patch(major: u8, minor: u8, patch: u8) -> Self {
         Self {
             major,
@@ -155,6 +162,7 @@ impl PutKeyValue for Version {
     }
 }
 
+/// Server filter.
 #[derive(Clone, Debug, Default, PartialEq, Eq)]
 pub struct Filter<'a> {
     /// Servers running the specified modification (ex. cstrike)
@@ -165,18 +173,22 @@ pub struct Filter<'a> {
     pub clver: Option<Version>,
     /// Protocol version
     pub protocol: Option<u8>,
+    /// A number that master must sent back to game client.
     pub key: Option<u32>,
-
+    /// Additional filter flags.
     pub flags: FilterFlags,
+    /// Filter flags mask.
     pub flags_mask: FilterFlags,
 }
 
 impl Filter<'_> {
+    /// Insert filter flag.
     pub fn insert_flag(&mut self, flag: FilterFlags, value: bool) {
         self.flags.set(flag, value);
         self.flags_mask.insert(flag);
     }
 
+    /// Returns `true` if a server matches the filter.
     pub fn matches(&self, _addr: SocketAddrV4, info: &ServerInfo) -> bool {
         !((info.flags & self.flags_mask) != self.flags
             || self.gamedir.map_or(false, |s| *s != &*info.gamedir)
diff --git a/protocol/src/game.rs b/protocol/src/game.rs
index 7353161..91f4f92 100644
--- a/protocol/src/game.rs
+++ b/protocol/src/game.rs
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
+//! Game client packets.
+
 use std::fmt;
 use std::net::SocketAddrV4;
 
@@ -9,14 +11,19 @@ use crate::filter::Filter;
 use crate::server::Region;
 use crate::Error;
 
+/// Request a list of server addresses from master servers.
 #[derive(Clone, Debug, PartialEq)]
 pub struct QueryServers<T> {
+    /// Servers must be from the `region`.
     pub region: Region,
+    /// Last received server address __(not used)__.
     pub last: SocketAddrV4,
+    /// Select only servers that match the `filter`.
     pub filter: T,
 }
 
 impl QueryServers<()> {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"1";
 }
 
@@ -24,6 +31,7 @@ impl<'a, T: 'a> QueryServers<T>
 where
     T: TryFrom<&'a [u8], Error = Error>,
 {
+    /// Decode packet from `src`.
     pub fn decode(src: &'a [u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(QueryServers::HEADER)?;
@@ -46,6 +54,7 @@ impl<'a, T: 'a> QueryServers<T>
 where
     for<'b> &'b T: fmt::Display,
 {
+    /// Encode packet to `buf`.
     pub fn encode(&self, buf: &mut [u8]) -> Result<usize, Error> {
         Ok(CursorMut::new(buf)
             .put_bytes(QueryServers::HEADER)?
@@ -58,18 +67,23 @@ where
     }
 }
 
+/// Request an information from a game server.
 #[derive(Clone, Debug, PartialEq)]
 pub struct GetServerInfo {
+    /// Client protocol version.
     pub protocol: u8,
 }
 
 impl GetServerInfo {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"\xff\xff\xff\xffinfo ";
 
+    /// Creates a new `GetServerInfo`.
     pub fn new(protocol: u8) -> Self {
         Self { protocol }
     }
 
+    /// Decode packet from `src`.
     pub fn decode(src: &[u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(Self::HEADER)?;
@@ -80,6 +94,7 @@ impl GetServerInfo {
         Ok(Self { protocol })
     }
 
+    /// Encode packet to `buf`.
     pub fn encode(&self, buf: &mut [u8]) -> Result<usize, Error> {
         Ok(CursorMut::new(buf)
             .put_bytes(Self::HEADER)?
@@ -88,13 +103,17 @@ impl GetServerInfo {
     }
 }
 
+/// Game client packets.
 #[derive(Clone, Debug, PartialEq)]
 pub enum Packet<'a> {
+    /// Request a list of server addresses from master servers.
     QueryServers(QueryServers<Filter<'a>>),
+    /// Request an information from a game server.
     GetServerInfo(GetServerInfo),
 }
 
 impl<'a> Packet<'a> {
+    /// Decode packet from `src`.
     pub fn decode(src: &'a [u8]) -> Result<Self, Error> {
         if let Ok(p) = QueryServers::decode(src) {
             return Ok(Self::QueryServers(p));
diff --git a/protocol/src/lib.rs b/protocol/src/lib.rs
index 83402f3..be03dc3 100644
--- a/protocol/src/lib.rs
+++ b/protocol/src/lib.rs
@@ -1,6 +1,10 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
+#![deny(missing_docs)]
+
+//! Xash3D protocol between clients, servers and masters.
+
 mod cursor;
 mod server_info;
 
@@ -18,18 +22,24 @@ use thiserror::Error;
 
 use crate::filter::Version;
 
+/// Current protocol version.
 pub const PROTOCOL_VERSION: u8 = 49;
-
+/// Current client version.
 pub const CLIENT_VERSION: Version = Version::new(0, 20);
 
+/// The error type for decoding and encoding packets.
 #[derive(Error, Debug, PartialEq, Eq)]
 pub enum Error {
+    /// Failed to decode a packet.
     #[error("Invalid packet")]
     InvalidPacket,
+    /// Invalid string in a packet.
     #[error("Invalid UTF-8 string")]
     InvalidString,
+    /// Buffer size is no enougth to decode or encode a packet.
     #[error("Unexpected end of buffer")]
     UnexpectedEnd,
+    /// Server protocol version is not supported.
     #[error("Invalid protocol version")]
     InvalidProtocolVersion,
 }
diff --git a/protocol/src/master.rs b/protocol/src/master.rs
index 7a2ebe1..41b019c 100644
--- a/protocol/src/master.rs
+++ b/protocol/src/master.rs
@@ -1,20 +1,27 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
+//! Master server packets.
+
 use std::net::{Ipv4Addr, SocketAddrV4};
 
 use super::cursor::{Cursor, CursorMut};
 use super::Error;
 
+/// Master server challenge response packet.
 #[derive(Clone, Debug, PartialEq)]
 pub struct ChallengeResponse {
+    /// A number that a game server must send back.
     pub master_challenge: u32,
+    /// A number that a master server received in challenge packet.
     pub server_challenge: Option<u32>,
 }
 
 impl ChallengeResponse {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"\xff\xff\xff\xffs\n";
 
+    /// Creates a new `ChallengeResponse`.
     pub fn new(master_challenge: u32, server_challenge: Option<u32>) -> Self {
         Self {
             master_challenge,
@@ -22,6 +29,7 @@ impl ChallengeResponse {
         }
     }
 
+    /// Decode packet from `src`.
     pub fn decode(src: &[u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(Self::HEADER)?;
@@ -38,6 +46,7 @@ impl ChallengeResponse {
         })
     }
 
+    /// Encode packet to `buf`.
     pub fn encode<const N: usize>(&self, buf: &mut [u8; N]) -> Result<usize, Error> {
         let mut cur = CursorMut::new(buf);
         cur.put_bytes(Self::HEADER)?;
@@ -49,17 +58,21 @@ impl ChallengeResponse {
     }
 }
 
+/// Game server addresses list.
 #[derive(Clone, Debug, PartialEq)]
 pub struct QueryServersResponse<I> {
     inner: I,
+    /// A challenge number received in a filter string.
     pub key: Option<u32>,
 }
 
 impl QueryServersResponse<()> {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"\xff\xff\xff\xfff\n";
 }
 
 impl<'a> QueryServersResponse<&'a [u8]> {
+    /// Decode packet from `src`.
     pub fn decode(src: &'a [u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(QueryServersResponse::HEADER)?;
@@ -83,6 +96,7 @@ impl<'a> QueryServersResponse<&'a [u8]> {
         Ok(Self { inner, key })
     }
 
+    /// Iterator over game server addresses.
     pub fn iter(&self) -> impl 'a + Iterator<Item = SocketAddrV4> {
         let mut cur = Cursor::new(self.inner);
         (0..self.inner.len() / 6).map(move |_| {
@@ -92,6 +106,7 @@ impl<'a> QueryServersResponse<&'a [u8]> {
         })
     }
 
+    /// Returns `true` if game server addresses list is empty.
     pub fn is_empty(&self) -> bool {
         self.inner.is_empty()
     }
@@ -101,10 +116,17 @@ impl<I> QueryServersResponse<I>
 where
     I: Iterator<Item = SocketAddrV4>,
 {
+    /// Creates a new `QueryServersResponse`.
     pub fn new(iter: I, key: Option<u32>) -> Self {
         Self { inner: iter, key }
     }
 
+    /// Encode packet to `buf`.
+    ///
+    /// If `buf` has not enougth size to hold all addresses the method must be called
+    /// multiple times until the end flag equals `true`.
+    ///
+    /// Returns how many bytes was written in `buf` and the end flag.
     pub fn encode(&mut self, buf: &mut [u8]) -> Result<(usize, bool), Error> {
         let mut cur = CursorMut::new(buf);
         cur.put_bytes(QueryServersResponse::HEADER)?;
@@ -129,18 +151,23 @@ where
     }
 }
 
+/// Announce a game client to game server behind NAT.
 #[derive(Clone, Debug, PartialEq)]
 pub struct ClientAnnounce {
+    /// Address of the client.
     pub addr: SocketAddrV4,
 }
 
 impl ClientAnnounce {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"\xff\xff\xff\xffc ";
 
+    /// Creates a new `ClientAnnounce`.
     pub fn new(addr: SocketAddrV4) -> Self {
         Self { addr }
     }
 
+    /// Decode packet from `src`.
     pub fn decode(src: &[u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(Self::HEADER)?;
@@ -152,6 +179,7 @@ impl ClientAnnounce {
         Ok(Self { addr })
     }
 
+    /// Encode packet to `buf`.
     pub fn encode(&self, buf: &mut [u8]) -> Result<usize, Error> {
         Ok(CursorMut::new(buf)
             .put_bytes(Self::HEADER)?
@@ -160,15 +188,20 @@ impl ClientAnnounce {
     }
 }
 
+/// Admin challenge response.
 #[derive(Clone, Debug, PartialEq)]
 pub struct AdminChallengeResponse {
+    /// A number that admin must sent back to a master server.
     pub master_challenge: u32,
+    /// A number with which to mix a password hash.
     pub hash_challenge: u32,
 }
 
 impl AdminChallengeResponse {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"\xff\xff\xff\xffadminchallenge";
 
+    /// Creates a new `AdminChallengeResponse`.
     pub fn new(master_challenge: u32, hash_challenge: u32) -> Self {
         Self {
             master_challenge,
@@ -176,6 +209,7 @@ impl AdminChallengeResponse {
         }
     }
 
+    /// Decode packet from `src`.
     pub fn decode(src: &[u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(Self::HEADER)?;
@@ -188,6 +222,7 @@ impl AdminChallengeResponse {
         })
     }
 
+    /// Encode packet to `buf`.
     pub fn encode(&self, buf: &mut [u8]) -> Result<usize, Error> {
         Ok(CursorMut::new(buf)
             .put_bytes(Self::HEADER)?
@@ -197,14 +232,21 @@ impl AdminChallengeResponse {
     }
 }
 
+/// Master server packet.
 #[derive(Clone, Debug, PartialEq)]
 pub enum Packet<'a> {
+    /// Master server challenge response packet.
     ChallengeResponse(ChallengeResponse),
+    /// Game server addresses list.
     QueryServersResponse(QueryServersResponse<&'a [u8]>),
+    /// Announce a game client to game server behind NAT.
+    ClientAnnounce(ClientAnnounce),
+    /// Admin challenge response.
     AdminChallengeResponse(AdminChallengeResponse),
 }
 
 impl<'a> Packet<'a> {
+    /// Decode packet from `src`.
     pub fn decode(src: &'a [u8]) -> Result<Self, Error> {
         if let Ok(p) = ChallengeResponse::decode(src) {
             return Ok(Self::ChallengeResponse(p));
@@ -214,6 +256,10 @@ impl<'a> Packet<'a> {
             return Ok(Self::QueryServersResponse(p));
         }
 
+        if let Ok(p) = ClientAnnounce::decode(src) {
+            return Ok(Self::ClientAnnounce(p));
+        }
+
         if let Ok(p) = AdminChallengeResponse::decode(src) {
             return Ok(Self::AdminChallengeResponse(p));
         }
diff --git a/protocol/src/server.rs b/protocol/src/server.rs
index b2c43b6..ce42496 100644
--- a/protocol/src/server.rs
+++ b/protocol/src/server.rs
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
+//! Game server packets.
+
 use std::fmt;
 
 use bitflags::bitflags;
@@ -11,18 +13,23 @@ use super::filter::Version;
 use super::types::Str;
 use super::Error;
 
+/// Sended to a master server before `ServerAdd` packet.
 #[derive(Clone, Debug, PartialEq)]
 pub struct Challenge {
+    /// A number that the server must return in response.
     pub server_challenge: Option<u32>,
 }
 
 impl Challenge {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"q\xff";
 
+    /// Creates a new `Challenge`.
     pub fn new(server_challenge: Option<u32>) -> Self {
         Self { server_challenge }
     }
 
+    /// Decode packet from `src`.
     pub fn decode(src: &[u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(Self::HEADER)?;
@@ -35,6 +42,7 @@ impl Challenge {
         Ok(Self { server_challenge })
     }
 
+    /// Encode packet to `buf`.
     pub fn encode<const N: usize>(&self, buf: &mut [u8; N]) -> Result<usize, Error> {
         let mut cur = CursorMut::new(buf);
         cur.put_bytes(Self::HEADER)?;
@@ -45,12 +53,17 @@ impl Challenge {
     }
 }
 
+/// The operating system on which the game server runs.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 #[repr(u8)]
 pub enum Os {
+    /// GNU/Linux.
     Linux,
+    /// Microsoft Windows
     Windows,
+    /// Apple macOS, OS X, Mac OS X
     Mac,
+    /// Unknown
     Unknown,
 }
 
@@ -105,12 +118,17 @@ impl fmt::Display for Os {
     }
 }
 
+/// Game server type.
 #[derive(Copy, Clone, Debug, PartialEq)]
 #[repr(u8)]
 pub enum ServerType {
+    /// Dedicated server.
     Dedicated,
+    /// Game client.
     Local,
+    /// Spectator proxy.
     Proxy,
+    /// Unknown.
     Unknown,
 }
 
@@ -168,17 +186,27 @@ impl fmt::Display for ServerType {
     }
 }
 
+/// The region of the world in which the server is located.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 #[repr(u8)]
 pub enum Region {
+    /// US East coast.
     USEastCoast = 0x00,
+    /// US West coast.
     USWestCoast = 0x01,
+    /// South America.
     SouthAmerica = 0x02,
+    /// Europe.
     Europe = 0x03,
+    /// Asia.
     Asia = 0x04,
+    /// Australia.
     Australia = 0x05,
+    /// Middle East.
     MiddleEast = 0x06,
+    /// Africa.
     Africa = 0x07,
+    /// Rest of the world.
     RestOfTheWorld = 0xff,
 }
 
@@ -214,33 +242,59 @@ impl GetKeyValue<'_> for Region {
 }
 
 bitflags! {
+    /// Additional server flags.
     #[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
     pub struct ServerFlags: u8 {
+        /// Server has bots.
         const BOTS      = 1 << 0;
+        /// Server is behind a password.
         const PASSWORD  = 1 << 1;
+        /// Server using anti-cheat.
         const SECURE    = 1 << 2;
+        /// Server is LAN.
         const LAN       = 1 << 3;
+        /// Server behind NAT.
         const NAT       = 1 << 4;
     }
 }
 
+/// Add/update game server information on the master server.
 #[derive(Clone, Debug, PartialEq, Default)]
 pub struct ServerAdd<T> {
+    /// Server is running the specified modification.
+    ///
+    /// ## Examples:
+    ///
+    /// * valve - Half-Life
+    /// * cstrike - Counter-Strike 1.6
+    /// * portal - Portal
+    /// * dod - Day of Defeat
+    /// * left4dead - Left 4 Dead
     pub gamedir: T,
+    /// Server is running `map`.
     pub map: T,
+    /// Server version.
     pub version: Version,
-    pub product: T,
+    /// Master server challenge number.
     pub challenge: u32,
+    /// Server type.
     pub server_type: ServerType,
+    /// Server is running on an operating system.
     pub os: Os,
+    /// Server is located in a `region`.
     pub region: Region,
+    /// Server protocol version.
     pub protocol: u8,
+    /// Current number of players on the server.
     pub players: u8,
+    /// Maximum number of players on the server.
     pub max: u8,
+    /// See `ServerFalgs`.
     pub flags: ServerFlags,
 }
 
 impl ServerAdd<()> {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"0\n";
 }
 
@@ -248,6 +302,7 @@ impl<'a, T> ServerAdd<T>
 where
     T: 'a + Default + GetKeyValue<'a>,
 {
+    /// Decode packet from `src`.
     pub fn decode(src: &'a [u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(ServerAdd::HEADER)?;
@@ -280,7 +335,6 @@ where
                         .unwrap_or_default()
                 }
                 b"region" => ret.region = cur.get_key_value()?,
-                b"product" => ret.product = cur.get_key_value()?,
                 b"bots" => ret.flags.set(ServerFlags::BOTS, cur.get_key_value()?),
                 b"password" => ret.flags.set(ServerFlags::PASSWORD, cur.get_key_value()?),
                 b"secure" => ret.flags.set(ServerFlags::SECURE, cur.get_key_value()?),
@@ -308,6 +362,7 @@ impl<T> ServerAdd<T>
 where
     T: PutKeyValue + Clone,
 {
+    /// Encode packet to `buf`.
     pub fn encode(&self, buf: &mut [u8]) -> Result<usize, Error> {
         Ok(CursorMut::new(buf)
             .put_bytes(ServerAdd::HEADER)?
@@ -321,7 +376,6 @@ where
             .put_key("os", self.os)?
             .put_key("version", self.version)?
             .put_key("region", self.region as u8)?
-            .put_key("product", self.product.clone())?
             .put_key("bots", self.flags.contains(ServerFlags::BOTS))?
             .put_key("password", self.flags.contains(ServerFlags::PASSWORD))?
             .put_key("secure", self.flags.contains(ServerFlags::SECURE))?
@@ -331,12 +385,15 @@ where
     }
 }
 
+/// Remove the game server from a list.
 #[derive(Clone, Debug, PartialEq)]
 pub struct ServerRemove;
 
 impl ServerRemove {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"b\n";
 
+    /// Decode packet from `src`.
     pub fn decode(src: &[u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(Self::HEADER)?;
@@ -344,26 +401,47 @@ impl ServerRemove {
         Ok(Self)
     }
 
+    /// Encode packet to `buf`.
     pub fn encode<const N: usize>(&self, buf: &mut [u8; N]) -> Result<usize, Error> {
         Ok(CursorMut::new(buf).put_bytes(Self::HEADER)?.pos())
     }
 }
 
+/// Game server information to game clients.
 #[derive(Clone, Debug, PartialEq, Default)]
 pub struct GetServerInfoResponse<T> {
+    /// Server is running the specified modification.
+    ///
+    /// ## Examples:
+    ///
+    /// * valve - Half-Life
+    /// * cstrike - Counter-Strike 1.6
+    /// * portal - Portal
+    /// * dod - Day of Defeat
+    /// * left4dead - Left 4 Dead
     pub gamedir: T,
+    /// Server is running `map`.
     pub map: T,
+    /// Server title.
     pub host: T,
+    /// Server protocol version.
     pub protocol: u8,
+    /// Current number of players on the server.
     pub numcl: u8,
+    /// Maximum number of players on the server.
     pub maxcl: u8,
+    /// Server is running a deathmatch game mode.
     pub dm: bool,
+    /// Players are grouped into teams.
     pub team: bool,
+    /// Server is running in a co-op game mode.
     pub coop: bool,
+    /// Server is behind a password.
     pub password: bool,
 }
 
 impl GetServerInfoResponse<()> {
+    /// Packet header.
     pub const HEADER: &'static [u8] = b"\xff\xff\xff\xffinfo\n";
 }
 
@@ -371,6 +449,7 @@ impl<'a, T> GetServerInfoResponse<T>
 where
     T: 'a + Default + GetKeyValue<'a>,
 {
+    /// Decode packet from `src`.
     pub fn decode(src: &'a [u8]) -> Result<Self, Error> {
         let mut cur = Cursor::new(src);
         cur.expect(GetServerInfoResponse::HEADER)?;
@@ -421,6 +500,7 @@ where
 }
 
 impl<'a> GetServerInfoResponse<&'a str> {
+    /// Encode packet to `buf`.
     pub fn encode(&self, buf: &mut [u8]) -> Result<usize, Error> {
         Ok(CursorMut::new(buf)
             .put_bytes(GetServerInfoResponse::HEADER)?
@@ -438,15 +518,21 @@ impl<'a> GetServerInfoResponse<&'a str> {
     }
 }
 
+/// Game server packet.
 #[derive(Clone, Debug, PartialEq)]
 pub enum Packet<'a> {
+    /// Sended to a master server before `ServerAdd` packet.
     Challenge(Challenge),
+    /// Add/update game server information on the master server.
     ServerAdd(ServerAdd<Str<&'a [u8]>>),
+    /// Remove the game server from a list.
     ServerRemove,
+    /// Game server information to game clients.
     GetServerInfoResponse(GetServerInfoResponse<Str<&'a [u8]>>),
 }
 
 impl<'a> Packet<'a> {
+    /// Decode packet from `src`.
     pub fn decode(src: &'a [u8]) -> Result<Self, Error> {
         if let Ok(p) = Challenge::decode(src) {
             return Ok(Self::Challenge(p));
@@ -497,7 +583,6 @@ mod tests {
             gamedir: "valve",
             map: "crossfire",
             version: Version::new(0, 20),
-            product: "foobar",
             challenge: 0x12345678,
             server_type: ServerType::Dedicated,
             os: Os::Linux,
diff --git a/protocol/src/server_info.rs b/protocol/src/server_info.rs
index ec785f1..0d0e85d 100644
--- a/protocol/src/server_info.rs
+++ b/protocol/src/server_info.rs
@@ -5,17 +5,25 @@ use super::filter::{FilterFlags, Version};
 use super::server::{Region, ServerAdd};
 use super::types::Str;
 
+/// Game server information.
 #[derive(Clone, Debug)]
 pub struct ServerInfo {
+    /// Server version.
     pub version: Version,
+    /// Server protocol version.
     pub protocol: u8,
+    /// Server midification.
     pub gamedir: Box<[u8]>,
+    /// Server map.
     pub map: Box<[u8]>,
+    /// Server additional filter flags.
     pub flags: FilterFlags,
+    /// Server region.
     pub region: Region,
 }
 
 impl ServerInfo {
+    /// Creates a new `ServerInfo`.
     pub fn new(info: &ServerAdd<Str<&[u8]>>) -> Self {
         Self {
             version: info.version,
diff --git a/protocol/src/types.rs b/protocol/src/types.rs
index d9a9eb9..54331da 100644
--- a/protocol/src/types.rs
+++ b/protocol/src/types.rs
@@ -1,10 +1,20 @@
 // SPDX-License-Identifier: GPL-3.0-only
 // SPDX-FileCopyrightText: 2023 Denis Drakhnia <numas13@gmail.com>
 
+//! Wrappers for byte slices with pretty-printers.
+
 use std::fmt;
 use std::ops::Deref;
 
-/// Wrapper for slice of bytes with printing the bytes as a string
+/// Wrapper for slice of bytes with printing the bytes as a string.
+///
+/// # Examples
+///
+/// ```rust
+/// # use xash3d_protocol::types::Str;
+/// let s = format!("{}", Str(b"\xff\talex\n"));
+/// assert_eq!(s, "\\xff\\talex\\n");
+/// ```
 #[derive(Copy, Clone, PartialEq, Eq, Default)]
 pub struct Str<T>(pub T);
 
@@ -51,7 +61,15 @@ impl<T> Deref for Str<T> {
     }
 }
 
-/// Wrapper for slice of bytes without printing
+/// Wrapper for slice of bytes without printing.
+///
+/// # Examples
+///
+/// ```rust
+/// # use xash3d_protocol::types::Hide;
+/// let s = format!("{}", Hide([1, 2, 3, 4]));
+/// assert_eq!(s, "<hidden>");
+/// ```
 #[derive(Copy, Clone, PartialEq, Eq, Default)]
 pub struct Hide<T>(pub T);