diff --git a/rpgdm-dice.el b/rpgdm-dice.el
index 03f2daa..be8d878 100644
--- a/rpgdm-dice.el
+++ b/rpgdm-dice.el
@@ -1,4 +1,4 @@
-;;; RPG-DM-HELPER --- Help for a Dungeon Master
+;;; RPG-DM-HELPER --- Help for a Dungeon Master -*- lexical-binding: t; -*-
 ;;
 ;; Author: Howard Abrams <howard@howardabrams.com>
 ;; Copyright © 2018, Howard Abrams, all rights reserved.