url-about.el: Add obsolete-since

* lisp/obsolete/url-about.el: Add obsolete-since.

diff --git a/lisp/obsolete/url-about.el b/lisp/obsolete/url-about.el
index a50986d511a5519125aefd288c1009bb35dc0445..608df3f2a5dae69fbc9a3f0a3a0244122122449f 100644 (file)
--- a/lisp/obsolete/url-about.el
+++ b/lisp/obsolete/url-about.el
@@ -3,6 +3,7 @@
 ;; Copyright (C) 2001-2022 Free Software Foundation, Inc.
 
 ;; Keywords: comm, data, processes, hypermedia
+;; Obsolete-since: 29.1
 
 ;; This file is part of GNU Emacs.
 ;;