diff --git a/etc/NEWS b/etc/NEWS
index 1a5047f60a5..f0289eb958d 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2690,6 +2690,11 @@ directories if you ask it for a "file:///dir" URL.  Since this is a
 low-level library, such decisions (if they are to be made at all) are
 left to higher-level functions.
 
+---
+** The url-ns.el library is now marked obsolete.
+This library is used to open configuration files for the long defunct
+web browser Netscape, and is no longer relevant.
+
 ** Image mode
 
 *** New library Exif.
diff --git a/lisp/url/url-ns.el b/lisp/obsolete/url-ns.el
similarity index 96%
rename from lisp/url/url-ns.el
rename to lisp/obsolete/url-ns.el
index 733f3a9e478..a301e461ad7 100644
--- a/lisp/url/url-ns.el
+++ b/lisp/obsolete/url-ns.el
@@ -3,6 +3,7 @@
 ;; Copyright (C) 1997-1999, 2004-2019 Free Software Foundation, Inc.
 
 ;; Keywords: comm, data, processes, hypermedia
+;; Obsolete-since: 27.1
 
 ;; This file is part of GNU Emacs.
 
@@ -19,6 +20,11 @@
 ;; You should have received a copy of the GNU General Public License
 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
+;;; Commentary:
+
+;; This file is obsolete.  For more information, see:
+;; https://debbugs.gnu.org/19822
+
 ;;; Code:
 
 (require 'url-gw)