21.4.21 and font-lock-add-keywords

[John Kuhns]

Hi XEmacs team -

So I installed xemacs 21.4.21 today and tried out the new
font-lock-add-keywords method. But, for some reason it's still not
working for me. Is there something I need to set to get it working?

Here's what I tried:
(add-hook 'lisp-mode-hook
(lambda () (font-lock-add-keywords 'lisp-mode
'(("\\<\\(then\\|else\\|@key\\|@optional\\)\\>" .
font-lock-keyword-face)))))

Which I want to result in highlighting standalone keywords. For example, 
@key should be hightlighted in this line:
(defun foo (arg1 @key arg2) ... )

Thanks,
-John Kuhns