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-rw-r--r--lisp/mail/rfc822.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/mail/rfc822.el b/lisp/mail/rfc822.el
index f07fcdfc9f1..2e97226662f 100644
--- a/lisp/mail/rfc822.el
+++ b/lisp/mail/rfc822.el
@@ -1,4 +1,4 @@
-;;; rfc822.el --- hairy RFC 822 (or later) parser for mail, news, etc.
+;;; rfc822.el --- hairy RFC 822 (or later) parser for mail, news, etc. -*- lexical-binding: t; -*-
;; Copyright (C) 1986-1987, 1990, 2001-2021 Free Software Foundation,
;; Inc.