(About external Lisp packages): New section.

etc/NEWS

@@ -21,6 +21,25 @@ Temporary note:
 When you add a new item, please add it without either +++ or ---
 so we will look at it and add it to the manual.
 
+
+* About external Lisp packages
+
+When you upgrade to Emacs 22 from a previous version, some older
+versions of external Lisp packages are known to behave badly.
+So in general, it is recommended that you upgrade to the latest
+versions of any external Lisp packages that you are using.
+
+You should also be aware that many Lisp packages have been included
+with Emacs 22 (see the extensive list below), and you should remove
+any older versions of these packages to ensure that the Emacs 22
+version is used.  You can use M-x list-load-path-shadows to find such
+older packages.
+
+Some specific packages which are known to cause problems are:
+
+** CEDET (upgrade to lastest version)
+** cua.el, cua-mode.el (remove old versions)
+
 
 * Installation Changes in Emacs 22.1
 
@@ -1684,7 +1703,7 @@ The following should work:
 {C,S,C-S,A}-{right,left,up,down,prior,next,delete,insert,F1-12}.
 These key bindings work on xterm from X.org 6.8 (and later versions),
 they might not work on some older versions of xterm, or on some
-proprietary versions.  
+proprietary versions.
 The various keys generated by xterm when the "modifyOtherKeys"
 resource is set are also supported.