Add missing copyright header to Release Notes

diff --git a/doc/notes/notes-9.21.3.rst b/doc/notes/notes-9.21.3.rst
index bb0fb99a9a88bd8a4955f59e0e3811b33c4dc938..bf21b872dcf7f2b7c0dc1177d194b3d8d3623a14 100644 (file)
--- a/doc/notes/notes-9.21.3.rst
+++ b/doc/notes/notes-9.21.3.rst
@@ -1,3 +1,14 @@
+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
 Notes for BIND 9.21.3
 ---------------------