Add missing version on gnus-group-update-hook

Signed-off-by: Julien Danjou <julien@danjou.info>

diff --git a/lisp/gnus-group.el b/lisp/gnus-group.el
index 8f7b2fd..399eb2a 100644 (file)
--- a/lisp/gnus-group.el
+++ b/lisp/gnus-group.el
@@ -295,6 +295,7 @@ If you want to modify the group buffer, you can use this hook."
 (defcustom gnus-group-update-hook nil
   "Hook called when a group line is changed."
   :group 'gnus-group-visual
+  :version "24.1"
   :type 'hook)
 
 (defcustom gnus-useful-groups