diff --git a/docs/devs/building/unix.md b/docs/devs/building/unix.md
index b96906d..5d1486d 100644
--- a/docs/devs/building/unix.md
+++ b/docs/devs/building/unix.md
@@ -66,7 +66,8 @@ Also you will need a bunch of development libraries:
 	    libboost-filesystem-dev \
 	    libboost-program-options-dev \
 	    libboost-system-dev \
-	    libssl-dev
+	    libssl-dev \
+	    zlib1g-dev
 
 If you need UPnP support miniupnpc development library should be installed (don't forget to rerun CMake with needed option):