(Lisp changes in 21.4): document (match-data t) change.

etc/ChangeLog

+2004-07-08  David Kastrup  <dak@gnu.org>
+
+	* NEWS (Lisp changes in 21.4): document (match-data t) change.
+
 2002-06-26  Eli Zaretskii  <eliz@is.elta.co.il>
 
 	* FOR-RELEASE: Moved to the admin directory.

etc/NEWS

@@ -2171,7 +2171,7 @@ mode-lines in inverse-video.
 ** New package benchmark.el contains simple support for convenient
 timing measurements of code (including the garbage collection component).
 
-** The new Lisp library fringe.el controls the apperance of fringes.
+** The new Lisp library fringe.el controls the appearance of fringes.
 
 ** `cfengine-mode' is a major mode for editing GNU Cfengine
 configuration files.
@@ -3563,6 +3563,11 @@ it in that buffer.
 ** In `replace-match', the replacement text no longer inherits
 properties from surrounding text.
 
++++
+** `(match-data t)' will append the buffer as a final element of the
+match data if the last match was on a buffer.  `set-match-data' will
+accept this for restoring the match state.
+
 +++
 ** New function `buffer-local-value'.