diff --git a/window-numbering.el b/window-numbering.el
index c092f47..0deca4b 100644
--- a/window-numbering.el
+++ b/window-numbering.el
@@ -6,7 +6,7 @@
 ;; Version: 1.1.1
 ;; Keywords: faces, matching
 ;; URL: http://nschum.de/src/emacs/window-numbering-mode/
-;; Compatibility: GNU Emacs 22.x
+;; Compatibility: GNU Emacs 22.x, GNU Emacs 23.x, GNU Emacs 24.x
 ;;
 ;; This file is NOT part of GNU Emacs.
 ;;