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diff --git a/lisp/mail/mailalias.el b/lisp/mail/mailalias.el
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--- a/lisp/mail/mailalias.el
+++ b/lisp/mail/mailalias.el
@@ -21,6 +21,12 @@
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;;; Commentary:
+
+;; Basic functions for defining and expanding mail aliases.
+;; These seal off the interface to the alias-definition parts of a
+;; .mailrc file formatted for BSD's Mail or USL's mailx.
+
;;; Code:
(defvar mail-aliases t