--- a/doc/4.0.rst	Mon Jun 24 12:00:03 2013 +0200
+++ b/doc/4.0.rst	Mon Jun 24 11:59:45 2013 +0200
@@ -11,6 +11,10 @@
 * ``SessionManager`` and ``AuthenticationManager`` now take a repo object at
   initialization time instead of a vreg.
 
+* The ``async`` argument of ``_cw.call_service`` have been dropped. All call are
+  now  synchronous. The zmq notification bus looks like a good replacement for
+  most async usecase.
+
 
 Deprecated Code Drops
 ----------------------