diff --git a/docs/user-guide/FAQ.md b/docs/user-guide/FAQ.md
index bbbcb50..94892d7 100644
--- a/docs/user-guide/FAQ.md
+++ b/docs/user-guide/FAQ.md
@@ -1,25 +1,64 @@
-Frequently asked questions
-==========================
-
 ## What is I2P?
 
-## How exactly I2P works? Is I2P better than Tor?
+I2P (Invisible Internet Protocol) is a universal anonymous network layer. 
+All communications over I2P are anonymous and end-to-end encrypted, participants
+don't reveal their real IP addresses. 
+
+I2P client is a software used for building and using anonymous I2P 
+networks. Such networks are commonly used for anonymous peer-to-peer 
+applications (filesharing, cryptocurrencies) and anonymous client-server 
+applications (websites, instant messengers, chat-servers).
 
-Learn more at https://geti2p.net
+I2P allows people from all around the world to communicate and share information
+without restrictions.
+
+Deeper technical introduction of I2P can be found [here](https://geti2p.net/en/docs/how/tech-intro).
 
 ## How i2pd differs from original I2P implementation?
 
+While [Java I2P](https://geti2p.net) is being original client for I2P network, i2pd has some big differences and advantages:
+
+* Java I2P has built-in applications for torrents, e-mail and so on. i2pd is just a router which you can use with other software through I2CP interface.
+* i2pd does not require Java. It's written in C++.
+* i2pd consumes less memory and CPU.
+* i2pd can be compiled everywhere gcc or clang presented (including Raspberry and routers).
+* i2pd has some major optimizations for faster cryptography which leads to less consumption of processor time and energy.
+
 ## What can I use i2pd for?
 
+i2pd can be used to organize anonymous network layer for any of your applications.
+
+You can run websites, create public and private chat chatrooms, use instant 
+messaging and E-Mail, share files -- do everything with strong privacy and 
+security layer.
+
 ## Why is network so slow and unstable sometimes?
 
-## What is good tunnel creation success rate value?
+Because it's secure design, your network connection goes encrypted through a chain of 6 
+random computers in the way to it's final destination. If one of those computers
+is shut down, or experiences connectivity problems -- it can take some time for
+I2P router to discover and fix that issue. 
 
-Average values are 15% - 40%. Larger is better.
+## Help! i2pd is not working. What to do?
 
-## Can use i2pd as a proxy for regular Internet?
+First of all, synchronize system clock on your machine with Internet.
 
-Not out of the box. You better use [Tor](https://www.torproject.org/) for that.
+If that does not help, on Linux machines, check the number of open file descriptors
+allowed to a proccess. Run:
+
+    ulimit -n
+
+Correct value for regular i2pd node is 4096, for a floodfill it is 8192. 
+Set it before you run i2pd like that:
+
+    ulimit -n 4096 && ./i2pd
+
+If that doesn't help, then you may have found a bug.
+Contact developers with IRC or create an issue on GitHub.
+
+## What is good tunnel creation success rate value?
+
+Average values are 15% - 40%. Larger is better.
 
 ## Are there any alive I2P websites?
 
@@ -39,4 +78,25 @@ Good idea is to configure [privoxy](https://wiki.archlinux.org/index.php/Privoxy
 
 i2pd socks proxy has an option to pass all non-i2p traffic to Tor socks proxy. Make sure you know what are you doing!
 
-## What is floodfill mode?
+## What is a floodfill mode?
+
+Floodfill mode is a special mode, which contributes to I2P network more.
+You may want to enable floodfill mode if you have stable uptime and high bandwidth
+to share.
+
+## How is I2P different from Tor?
+
+I2P and Tor has some similarities, but they are completely different in every way possible.
+
+Tor is designed to act as anonymous proxy for the regular Internet, I2P is 
+designed to create anonymous network layer with its own private resources.
+
+Tor Project was started by US military and has a long history of recieving funds
+from the government, while I2P was started by community of independent civilians.
+
+Tor is highly centralized by design, while I2P is decentralized and distributed.
+
+## Can use i2pd as a proxy for regular Internet?
+
+Not out of the box. You better use [Tor](https://www.torproject.org/) for that.
+