Fix minor mode docstrings for the new meaning of a nil ARG.

[bpt/emacs.git] / lisp / ruler-mode.el

diff --git a/lisp/ruler-mode.el b/lisp/ruler-mode.el
index fc62bf6..046c294 100644 (file)
--- a/lisp/ruler-mode.el
+++ b/lisp/ruler-mode.el
@@ -567,8 +567,10 @@ format first."
 
 ;;;###autoload
 (define-minor-mode ruler-mode
-  "Toggle Ruler mode.
-In Ruler mode, Emacs displays a ruler in the header line."
+  "Toggle display of ruler in header line (Ruler mode).
+With a prefix argument ARG, enable Ruler mode if ARG is positive,
+and disable it otherwise.  If called from Lisp, enable the mode
+if ARG is omitted or nil."
   nil nil
   ruler-mode-map
   :group 'ruler-mode