Added note about lower-case names.

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@1692 b35dd754-fafc-0310-a699-88a17e54d16e

src/plugins/broadcast/readme.html

@@ -85,5 +85,10 @@ default service name is being used, a message to all@broadcast.foo would be broa
 all users connected to the server. For the group staff, a message to staff@broadcast.foo would
 be sent to all users in the group staff that are currently online.
 
+<p>
+Note: for maximum compatability between group implementations, it's recommended that you use
+lower-case group names in conjunction with the broadcast plugin.
+</p>
+
 </body>
 </html>