* doc/lispref/modes.texi: Docs for obsolete '%m' in mode-line-format

diff --git a/doc/lispref/modes.texi b/doc/lispref/modes.texi
index e94093318fc462c79d6ae7db6a03f66973186edd..ad2b175afb801ae71469092bc52a96d3420f44f4 100644 (file)
--- a/doc/lispref/modes.texi
+++ b/doc/lispref/modes.texi
@@ -2507,15 +2507,13 @@ Dashes sufficient to fill the remainder of the mode line.
 @item %%
 The character @samp{%}---this is how to include a literal @samp{%} in a
 string in which @code{%}-constructs are allowed.
-@end table
-
-The following @code{%}-construct is still supported, but it is
-obsolete, since you can get the same result using the variable
-@code{mode-name}.
 
-@table @code
 @item %m
-The value of @code{mode-name}.
+Obsolete; use the @code{mode-name} variable instead.  The @code{%m}
+construct is still supported, but it is inadequate, as it produces an
+empty string if the value of the @code{mode-name} variable is a
+non-string mode-line construct (for example, in
+@code{emacs-lisp-mode}).
 @end table
 
 @node Properties in Mode