diff --git a/calendar/ChangeLog b/calendar/ChangeLog
index 2c772ac..54810ba 100644
--- a/calendar/ChangeLog
+++ b/calendar/ChangeLog
@@ -1,3 +1,11 @@
+2008-01-03  Ondrej Jirman  <megous@megous.com>
+
+	** Fix for bug #506457
+
+	* libedata-cal/e-data-cal-factory.c: Serialize access to the 
+	priv->backends hash table using mutex. This prevents a race while
+	adding backends to the table.
+
 2007-12-13  Milan Crha  <mcrha@redhat.com>
 
 	** Fix for bug #502866
