* doc/emacs/files.texi: Comment.

diff --git a/doc/emacs/files.texi b/doc/emacs/files.texi
index a85c16ee1bc1eb7230aa4893ceb81c1e9147ff13..3e92d4d468741efd57e09f90a7a1e0e59df17868 100644 (file)
--- a/doc/emacs/files.texi
+++ b/doc/emacs/files.texi
@@ -1253,9 +1253,12 @@ minibuffer, and displays the differences between the two files in a
 buffer named @file{*diff*}.  This works by running the @command{diff}
 program, using options taken from the variable @code{diff-switches}.
 The value of @code{diff-switches} should be a string; the default is
-@code{"-c"} to specify a context diff.  @xref{Top,, Diff, diff,
-Comparing and Merging Files}, for more information about the
-@command{diff} program.
+@code{"-c"} to specify a context diff.
+@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
+information about the @command{diff} program.
 
   The output of the @code{diff} command is shown using a major mode
 called Diff mode.  @xref{Diff Mode}.