diff --git a/drupal/README.md b/drupal/README.md
index 3141fc5..7c57e0d 100644
--- a/drupal/README.md
+++ b/drupal/README.md
@@ -4,5 +4,8 @@
 
 ##Modules available
 
-[Google Code Prettify](http://drupal.org/project/prettify)
-Simple and lightweight syntax highlighting of source code snippets using Google Code Prettify JavaScript library for Drupal.
+[Google Code Prettify](http://drupal.org/project/prettify)  
+Simple and lightweight syntax highlighting of source code snippets using the [Google Code Prettify](http://code.google.com/p/google-code-prettify/) JavaScript library.
+
+[GeSHi Filter](http://drupal.org/project/geshifilter)  
+Uses the third-party PHP library [GeSHi (Generic Syntax Highlighter)](http://qbnz.com/highlighter/)