diff --git a/README.md b/README.md
index bfd6b80..6b4f720 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ Because php-gtk is such a pain to compile on Windows, I've put together this pac
 ## PHP Requirements
 * Version 5.2 - 5.3.*
 * PHP-Cario PECL extension
+* [PHP-GTK](http://gtk.php.net) PHP Extension
 * Curl
 * OpenSSL
 * JSON