- "Toggle File-Name Shadow mode.
-When active, any part of a filename being read in the minibuffer
-that would be ignored (because the result is passed through
+ "Toggle file-name shadowing in minibuffers (File-Name Shadow mode).
+With a prefix argument ARG, enable File-Name Shadow mode if ARG
+is positive, and disable it otherwise. If called from Lisp,
+enable the mode if ARG is omitted or nil.
+
+File-Name Shadow mode is a global minor mode. When enabled, any
+part of a filename being read in the minibuffer that would be
+ignored (because the result is passed through