Mention comint prompt highlighting.

etc/NEWS

@@ -626,10 +626,10 @@ The command M-x comint-redirect-send-command-to-process acts like
 M-x comint-redirect-send-command but additionally reads the name of
 the buffer whose process should be used from the mini-buffer.
 
-Packages based on comint.el like shell-mode, and
-scheme-interaction-mode now highlight user input, and support choosing
-previous input with mouse-2.  To control this feature, see the
-user-option `comint-highlight-input'.
+Packages based on comint.el like shell-mode, and scheme-interaction-mode
+now highlight user input and program prompts, and support choosing
+previous input with mouse-2.  To control these feature, see the
+user-options `comint-highlight-input' and `comint-highlight-prompt'.
 
 ** Changes to Rmail mode