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-rw-r--r--lisp/mail/mailabbrev.el10
1 files changed, 9 insertions, 1 deletions
diff --git a/lisp/mail/mailabbrev.el b/lisp/mail/mailabbrev.el
index 901eb002dc1..2472b8a1870 100644
--- a/lisp/mail/mailabbrev.el
+++ b/lisp/mail/mailabbrev.el
@@ -133,7 +133,15 @@
;;;###autoload
(define-minor-mode mail-abbrevs-mode
- "Non-nil means expand mail aliases as abbrevs, in certain message headers."
+ "Toggle abbrev expansion of mail aliases (Mail Abbrevs mode).
+With a prefix argument ARG, enable Mail Abbrevs mode if ARG is
+positive, and disable it otherwise. If called from Lisp, enable
+the mode if ARG is omitted or nil.
+
+Mail Abbrevs mode is a global minor mode. When enabled,
+abbrev-like expansion is performed when editing certain mail
+headers (those specified by `mail-abbrev-mode-regexp'), based on
+the entries in your `mail-personal-alias-file'."
:global t
:group 'mail-abbrev
:version "20.3"