;;; mh-thread.el --- MH-E threading support
-;; Copyright (C) 2002-2004, 2006-2012 Free Software Foundation, Inc.
+;; Copyright (C) 2002-2004, 2006-2016 Free Software Foundation, Inc.
;; Author: Satyaki Das <satyaki@theforce.stanford.edu>
;; Maintainer: Bill Wohler <wohler@newt.com>
;; The threading portion of this files tries to implement the
;; algorithm described at:
;; http://www.jwz.org/doc/threading.html
-;; It also begins to implement the IMAP Threading extension RFC. The
-;; implementation lacks the reference and subject canonicalization of
-;; the RFC.
+;; It also begins to implement the threading section of the IMAP -
+;; SORT and THREAD Extensions RFC at:
+;; http://tools.ietf.org/html/rfc5256
+;; The implementation lacks the reference and subject canonicalization
+;; of the RFC.
;; In the presentation buffer, children messages are shown indented
;; with either [ ] or < > around them. Square brackets ([ ]) denote