"Edit Dired buffer with Wdired, or make it read-only.
If the current buffer can be edited with Wdired, (i.e. the major
mode is `dired-mode'), call `wdired-change-to-wdired-mode'.
-Otherwise, call `toggle-read-only'."
+Otherwise, toggle `read-only-mode'."
(interactive)
(if (derived-mode-p 'dired-mode)
(wdired-change-to-wdired-mode)