message-insert-signature doc fix

* lisp/gnus/message.el (message-insert-signature): Clarify what
FORCE means.

diff --git a/lisp/gnus/message.el b/lisp/gnus/message.el
index a906e56aac6594094bc12231874bc3492757875a..7d89739197333780f1f308156fc1809ca0d5e3b3 100644 (file)
--- a/lisp/gnus/message.el
+++ b/lisp/gnus/message.el
@@ -3615,7 +3615,14 @@ Message buffers and is not meant to be called directly."
       (do-auto-fill))))
 
 (defun message-insert-signature (&optional force)
-  "Insert a signature.  See documentation for variable `message-signature'."
+  "Insert a signature at the end of the buffer.
+
+See the documentation for the `message-signature' variable for
+more information.
+
+If FORCE is 0 (or when called interactively), the global values
+of the signature variables will be consulted if the local ones
+are null."
   (interactive (list 0))
   (let ((message-signature message-signature)
        (message-signature-file message-signature-file))