- "Toggle Dired-Omit mode.
-With numeric ARG, enable Dired-Omit mode if ARG is positive, disable
-otherwise. Enabling and disabling is buffer-local.
-If enabled, \"uninteresting\" files are not listed.
-Uninteresting files are those whose filenames match regexp `dired-omit-files',
-plus those ending with extensions in `dired-omit-extensions'.
+ "Toggle omission of uninteresting files in Dired (Dired-Omit mode).
+With a prefix argument ARG, enable Dired-Omit mode if ARG is
+positive, and disable it otherwise. If called from Lisp, enable
+the mode if ARG is omitted or nil.