diff --git a/alert-termux.el b/alert-termux.el
index 214d322..63ecb74 100644
--- a/alert-termux.el
+++ b/alert-termux.el
@@ -1,4 +1,4 @@
-;;; alert-termux --- alert.el notifications on Termux
+;;; alert-termux --- alert.el notifications on Termux  -*- lexical-binding: t; -*-
 
 ;; Copyright (C) 2018 Gergely Polonkai