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-rw-r--r--lisp/progmodes/autoconf.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/progmodes/autoconf.el b/lisp/progmodes/autoconf.el
index 5d5811b47d1..d12bed7e27d 100644
--- a/lisp/progmodes/autoconf.el
+++ b/lisp/progmodes/autoconf.el
@@ -1,4 +1,4 @@
-;;; autoconf.el --- mode for editing Autoconf configure.ac files
+;;; autoconf.el --- mode for editing Autoconf configure.ac files -*- lexical-binding: t; -*-
;; Copyright (C) 2000-2020 Free Software Foundation, Inc.