diff --git a/doc/assistant/release_notes.mdwn b/doc/assistant/release_notes.mdwn
index 7f793be71f..6ce8bac762 100644
--- a/doc/assistant/release_notes.mdwn
+++ b/doc/assistant/release_notes.mdwn
@@ -1,3 +1,7 @@
+## version 4.20130521
+
+This is a bugfix release. Recommended upgrade.
+
 ## version 4.20130516
 
 This version contains numerous bug fixes, and improvements.