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-rw-r--r--lisp/tooltip.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/tooltip.el b/lisp/tooltip.el
index 5f5a4788b26..00d21666c23 100644
--- a/lisp/tooltip.el
+++ b/lisp/tooltip.el
@@ -1,4 +1,4 @@
-;;; tooltip.el --- show tooltip windows
+;;; tooltip.el --- show tooltip windows -*- lexical-binding:t -*-
;; Copyright (C) 1997, 1999-2020 Free Software Foundation, Inc.