diff --git a/lib/fg42/extension.el b/lib/fg42/extension.el
index 464b518..9aaa5b4 100644
--- a/lib/fg42/extension.el
+++ b/lib/fg42/extension.el
@@ -1,4 +1,4 @@
-;;; Extebtuib --- Extension library of FG42
+;;; extension --- Extension library of FG42
 ;;; Commentary:
 ;;; Code: