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diff --git a/lisp/mail/rfc822.el b/lisp/mail/rfc822.el
index f23f3029a17..373b0a85a2c 100644
--- a/lisp/mail/rfc822.el
+++ b/lisp/mail/rfc822.el
@@ -22,6 +22,11 @@
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;;; Commentary:
+
+;; Support functions for parsing RFC-822 headers, used by mail and news
+;; modes.
+
;;; Code:
;; uses address-start free, throws to address