diff --git a/docs/developing.rst b/docs/developing.rst
index 7856e5a9f..99c28f348 100644
--- a/docs/developing.rst
+++ b/docs/developing.rst
@@ -51,6 +51,13 @@ If you installed MSYS2 into an alternate directory please use that instead of C:
 Then in the same prompt, without closing it first, continue with the steps in the next section.
 If you close the prompt you will need to rerun the last commands before you can rebuild.
 
+Linux prerequisites
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. code-block:: shell
+
+    sudo apt-get install zlib1g-dev
+    
 Building
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -84,7 +91,7 @@ Linux
 
 .. code-block:: shell
 
-    sudo apt-get install capnproto libcapnp-dev libqt5opengl5-dev qtbase5-dev
+    sudo apt-get install capnproto libcapnp-dev libqt5opengl5-dev qtbase5-dev zlib1g-dev
     cmake . -DBUILD_UI=ON -UPYLIB_DIRECTORY
     make -j$(grep -c ^processor /proc/cpuinfo)
     ./gym-retro-integration
@@ -92,4 +99,4 @@ Linux
 Windows
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Building from source on Windows is currently difficult to configure. Docker containers for cross-compiling are available at `openai/travis-build <https://hub.docker.com/r/openai/travis-build/>`_.
\ No newline at end of file
+Building from source on Windows is currently difficult to configure. Docker containers for cross-compiling are available at `openai/travis-build <https://hub.docker.com/r/openai/travis-build/>`_.