tweak doc for 'change_session_expires'

diff --git a/lib/Catalyst/Plugin/Session.pm b/lib/Catalyst/Plugin/Session.pm
index 59c94fb..0aae817 100644 (file)
--- a/lib/Catalyst/Plugin/Session.pm
+++ b/lib/Catalyst/Plugin/Session.pm
@@ -858,6 +858,8 @@ You can change the session expiration time for this session;
 
     $c->change_session_expires( 4000 );
 
+Note that this only works to set the session longer than the config setting.
+
 =back
 
 =head1 INTERNAL METHODS