a file, _are_ mentioned by buffer-menu.
Buffers that are ephemeral and generally uninteresting to the user
have names starting with a space, so that the @code{list-buffers} and
-@code{buffer-menu} commands don't mention them. A name starting with
+@code{buffer-menu} commands don't mention them (but if such a buffer
+visits a file, it @strong{is} mentioned). A name starting with
space also initially disables recording undo information; see
@ref{Undo}.