* message.el (message-send-and-exit): Document `arg'.

diff --git a/lisp/message.el b/lisp/message.el
index a7045da..4810655 100644 (file)
--- a/lisp/message.el
+++ b/lisp/message.el
@@ -4066,7 +4066,9 @@ The text will also be indented the normal way."
 ;;;
 
 (defun message-send-and-exit (&optional arg)
-  "Send message like `message-send', then, if no errors, exit from mail buffer."
+  "Send message like `message-send', then, if no errors, exit from mail buffer.
+The usage of ARG is defined by the instance that called Message.
+It should typically alter the sending method in some way or other."
   (interactive "P")
   (let ((buf (current-buffer))
        (actions message-exit-actions))