etc/NEWS: Mention impact of old-style backquotes on key sequences.

diff --git a/etc/NEWS b/etc/NEWS
index 2629155110f7194113928f8b4e225215e9424758..b611d726eeaec4f3bfa6f1df1a4caa98e57ac3bf 100644 (file)
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1049,12 +1049,16 @@ of the header line.
 ** Support for "old-style" backquotes, which have been obsolete for
 more than 10 years, has been further reduced.  Now a backquote not
 followed by a space is always treated as a "new-style" backquote.
-Please consider completely removing all "old-style" backquotes from
-your code as a matter of some urgency.  If your code uses backquotes
-as documented in the Elisp manual, and compiles without warning, then
-you have nothing to do in this regard.  Code not following the
-appropriate conventions may fail to compile.  The most common cause of
-trouble seems to be an old-style backquote followed by a newline.
+Please remove all "old-style" backquotes from your code.  If your code
+uses backquotes as documented in the Elisp manual, and compiles
+without warning, then you have nothing to do in this regard.  Code not
+following the appropriate conventions may fail to compile.
+
+The most common cause of trouble seems to be an old-style backquote
+followed by a newline.  Another cause of trouble is vector notation
+for key sequence notation: instead of [(control ,)] and [(control ')],
+you should write [(control ?,)] and [(control ?')], which will work in
+older Emacs too.
 
 +++
 ** The macro `eval-at-startup' was removed in Emacs 23.2, but this