@c Note that the actual name of the info file is diffutils.info,
@c but it adds a dir entry for diff too.
@c On older systems, only "info diff" works, not "info diffutils".
-@xref{Top,, Diff, diff, Comparing and Merging Files}, for more
+@xref{Top,, Diff, diffutils, Comparing and Merging Files}, for more
information about the @command{diff} program.
The output of the @code{diff} command is shown using a major mode