diff --git a/UserDoc.md b/UserDoc.md
index 8abb60f1..98a28294 100644
--- a/UserDoc.md
+++ b/UserDoc.md
@@ -27,4 +27,5 @@ Optional topics:
 
 -   [How to install Nvidia driver in dom0](/wiki/InstallNvidiaDriver)
 -   [Getting Sony Vaio Z laptop to work with Qubes](/wiki/SonyVaioTinkering)
+-   [​How to get composition working on ATI GPUs](https://groups.google.com/group/qubes-devel/browse_thread/thread/5a0dfc38fd1cc16a)