--- a/readme.txt
+++ b/readme.txt
@@ -192,8 +192,18 @@
 the following sections) as sooner or later you will run into graphical glitches
 when using other versions of the game.
 
-If you want AIs use the in-game content downloader to download some or download
-some from the internet and place them in the ai/ directory.
+If you want AIs use the in-game content downloader. If for some reason that is
+not possible or you want to use an AI that has not been uploaded to the content
+download system download the tar file and place it in the ai/ directory. If the
+AI needs libraries you'll have to download those too and put them in the
+ai/library/ directory. All AIs and AI Libraries that have been uploaded to
+the content download system can be found at http://noai.openttd.org/downloads/
+The AIs and libraries can be found their in the form of .tar.gz packages.
+OpenTTD can read inside tar files but it does not extract .tar.gz files by
+itself.
+To figure out which libraries you need for an AI you have to start the AI and
+wait for an error message to pop up. The error message will tell you
+"couldn't find library 'lib-name'". Download that library and try again.
 
 4.2) OpenTTD directories
 ---- -------------------------------