diff --git a/CHANGES b/CHANGES
index 10ed8e9c..1fdc0d86 100644
--- a/CHANGES
+++ b/CHANGES
@@ -10,7 +10,8 @@ Codename to be decided, release date to be announced.
 
 - fixed a bug with subdomains that was caused by the inability to
   specify the server name.  The server name can now be set with
-  the `SERVER_NAME` config key.
+  the `SERVER_NAME` config key.  This key is now also used to set
+  the session cookie cross-subdomain wide.
 - autoescaping is no longer active for all templates.  Instead it
   is only active for ``.html``, ``.htm``, ``.xml`` and ``.xhtml``.
   Inside templates this behaviour can be changed with the