diff --git a/Docs/cmake-mode.el b/Docs/cmake-mode.el
index 0cd7b3e9f..1ea8e58cf 100644
--- a/Docs/cmake-mode.el
+++ b/Docs/cmake-mode.el
@@ -25,7 +25,7 @@
 ;;  (setq load-path (cons (expand-file-name "/dir/with/cmake-mode") load-path))
 ;;  (require 'cmake-mode)
 ;;  (setq auto-mode-alist
-;;        (append '(("CMakeLists\\.txt" . cmake-mode)
+;;        (append '(("CMakeLists\\.txt$" . cmake-mode)
 ;;                  ("\\.cmake$" . cmake-mode))
 ;;                auto-mode-alist))