diff --git a/README.md b/README.md
index f944a36..3fec52b 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ Plugin to CASify your Redmine installation.
 ## Compatibility
 
 Tested with Redmine 2.2.3, but should be working fine with Redmine 2.x and possibly 1.x.
+We use [CASino](http://casino.rbcas.com) as CAS server, but it should work with others as well.
 
 ## Installation