diff --git a/lisp/button.el b/lisp/button.el
index ef0f3d11c65..17460fc8bcf 100644
--- a/lisp/button.el
+++ b/lisp/button.el
@@ -1,4 +1,4 @@
-;;; button.el --- Clickable buttons
+;;; button.el --- clickable buttons
 ;;
 ;; Copyright (C) 2001 Free Software Foundation, Inc.
 ;;