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+.. 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 9.16.21
+----------------------
+
+New Features
+~~~~~~~~~~~~
+
+- Support for HTTPS and SVCB record types has been added. (This does not
+  include ADDITIONAL section processing for these record types, only
+  basic support for RR type parsing and printing.) :gl:`#1132`
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- When ``dnssec-signzone`` signs a zone using a successor key whose
+  predecessor is still published, it now only refreshes signatures for
+  RRsets which have an invalid signature, an expired signature, or a
+  signature which expires within the provided cycle interval. This
+  allows ``dnssec-signzone`` to gradually replace signatures in a zone
+  whose ZSK is being rolled over (similarly to what ``auto-dnssec
+  maintain;`` does). :gl:`#1551`
+
+Bug Fixes
+~~~~~~~~~
+
+- A recent change to the internal memory structure of zone databases
+  inadvertently neglected to update the MAPAPI value for zone files in
+  ``map`` format. This caused version 9.16.20 of ``named`` to attempt to
+  load files into memory that were no longer compatible, triggering an
+  assertion failure on startup. The MAPAPI value has now been updated,
+  so ``named`` rejects outdated files when encountering them.
+  :gl:`#2872`
+
+- Zone files in ``map`` format whose size exceeded 2 GB failed to load.
+  This has been fixed. :gl:`#2878`
+
+- ``named`` was unable to run as a Windows Service under certain
+  circumstances. This has been fixed. :gl:`#2837`
+
+- Stale data in the cache could cause ``named`` to send non-minimized
+  queries despite QNAME minimization being enabled. This has been fixed.
+  :gl:`#2665`
+
+- When a DNSSEC-signed zone which only has a single signing key
+  available is migrated to ``dnssec-policy``, that key is now treated as
+  a Combined Signing Key (CSK). :gl:`#2857`
+
+- When a dynamic zone was made available in another view using the
+  ``in-view`` statement, running ``rndc freeze`` always reported an
+  ``already frozen`` error even though the zone was successfully
+  frozen. This has been fixed. :gl:`#2844`
+
+Known Issues
+~~~~~~~~~~~~
+
+- There are no new known issues with this release. See :ref:`above
+  <relnotes_known_issues>` for a list of all known issues affecting this
+  BIND 9 branch.