** Code that uses `concat' with integer args now gets an error, as
long promised.
-** `scroll-left' and `scroll-right' are only effective when
-`automatic-hscrolling' is nil.
-
-** The new character sets occupy private charset slots.
-
-The new charsets `japanese-jisx0213-2', `mule-unicode-0100-24ff',
-`mule-unicode-2500-33ff', and `mule-unicode-e000-ffff' take up 4 slots
-for new charsets in the private area of the Mule internal character
-representation. This might cause add-on packages which add
-dimension-2 charsets to fail, because there's no only 1 slot left for
-such charsets. (There are still many free slots for dimension-1
-charsets.)
+** Not a Lisp incompatibility as such but, with the introduction of
+extra private charsets, there is now only one slot free for a new
+dimension-2 private charset. User code which tries to add more than
+one extra will fail unless you rebuild Emacs with some standard
+charset(s) removed; that is probably inadvisable because it changes
+the emacs-mule encoding. Also, files stored in the emacs-mule
+encoding using an Emacs 20 with additional private charsets defined
+will probably not be read correctly by Emacs 21.
\f
* Lisp changes made after edition 2.6 of the Emacs Lisp Manual,
+2001-02-20 Dave Love <fx@gnu.org>
+
+ * international/utf-8.el: Doc and commentary fixes.
+
2001-02-20 Eli Zaretskii <eliz@is.elta.co.il>
* ehelp.el (with-electric-help): Doc fix.