diff --git a/lisp/mwheel.el b/lisp/mwheel.el
index 8236d08dbc9..7b1ee5f369e 100644
--- a/lisp/mwheel.el
+++ b/lisp/mwheel.el
@@ -56,7 +56,8 @@
 
 (defvar mouse-wheel-down-button 4)
 (make-obsolete-variable 'mouse-wheel-down-button
-                        'mouse-wheel-down-event)
+                        'mouse-wheel-down-event
+			"22.1")
 (defcustom mouse-wheel-down-event
   ;; In the latest versions of XEmacs, we could just use mouse-%s as well.
   (if (memq window-system '(w32 mac))
@@ -70,7 +71,8 @@
 
 (defvar mouse-wheel-up-button 5)
 (make-obsolete-variable 'mouse-wheel-up-button
-                        'mouse-wheel-up-event)
+                        'mouse-wheel-up-event
+			"22.1")
 (defcustom mouse-wheel-up-event
   ;; In the latest versions of XEmacs, we could just use mouse-%s as well.
   (if (memq window-system '(w32 mac))
@@ -84,7 +86,8 @@
 
 (defvar mouse-wheel-click-button 2)
 (make-obsolete-variable 'mouse-wheel-click-button
-                        'mouse-wheel-click-event)
+                        'mouse-wheel-click-event
+			"22.1")
 (defcustom mouse-wheel-click-event
   ;; In the latest versions of XEmacs, we could just use mouse-%s as well.
   (intern (format (if (featurep 'xemacs) "button%s" "mouse-%s")