diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 99bb10595694b7f748bdd9f8c85a6a0f49b07e00..88ed61cd1d500ce29a51aae9be429a37bf537e1b 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,8 @@
 2010-03-11  Glenn Morris  <rgm@gnu.org>
 
+	* cus-edit.el (customize-changed-options-previous-release):
+	Bump to 23.1.
+
 	* image.el (image-animate-max-time): Fix :version tag.
 
 2010-03-10  Chong Yidong  <cyd@stupidchicken.com>
diff --git a/lisp/cus-edit.el b/lisp/cus-edit.el
index b815e31f31cb37a0b3ecaf4364b020b6b8c75bf8..851026929a7f2194bbeb14f3bc3562849bb5b09e 100644
--- a/lisp/cus-edit.el
+++ b/lisp/cus-edit.el
@@ -1136,7 +1136,7 @@ Show the buffer in another window, but don't select it."
     (unless (eq symbol basevar)
       (message "`%s' is an alias for `%s'" symbol basevar))))
 
-(defvar customize-changed-options-previous-release "22.1"
+(defvar customize-changed-options-previous-release "23.1"
   "Version for `customize-changed-options' to refer back to by default.")
 
 ;; Packages will update this variable, so make it available.