diff --git a/doc/arm/notes.rst b/doc/arm/notes.rst
index 9a4c08ed5f..e77156befc 100644
--- a/doc/arm/notes.rst
+++ b/doc/arm/notes.rst
@@ -45,6 +45,7 @@ The list of known issues affecting the latest version in the 9.20 branch can be
 found at
 https://gitlab.isc.org/isc-projects/bind9/-/wikis/Known-Issues-in-BIND-9.20
 
+.. include:: ../notes/notes-9.20.18.rst
 .. include:: ../notes/notes-9.20.17.rst
 .. include:: ../notes/notes-9.20.16.rst
 .. include:: ../notes/notes-9.20.15.rst
diff --git a/doc/notes/notes-9.20.18.rst b/doc/notes/notes-9.20.18.rst
new file mode 100644
index 0000000000..5381cf6062
--- /dev/null
+++ b/doc/notes/notes-9.20.18.rst
@@ -0,0 +1,92 @@
+.. 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 9.20.18
+----------------------
+
+Security Fixes
+~~~~~~~~~~~~~~
+
+- [CVE-2025-13878] Fix incorrect length checks for BRID and HHIT
+  records.
+
+  Malformed BRID and HHIT records could trigger an assertion failure.
+  This has been fixed.
+
+  ISC would like to thank Vlatko Kosturjak from Marlink Cyber for
+  bringing this vulnerability to our attention. :gl:`#5616`
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- Add more information to the rndc recursing output about fetches.
+
+  This adds more information about the active fetches for debugging and
+  diagnostic purposes.
+
+Bug Fixes
+~~~~~~~~~
+
+- Make key rollovers more robust.
+
+  A manual rollover when the zone is in an invalid DNSSEC state causes
+  predecessor keys to be removed too quickly. Additional safeguards to
+  prevent this have been added. DNSSEC records will not be removed from
+  the zone until the underlying state machine has moved back into a
+  valid DNSSEC state. :gl:`#5458`
+
+- Fix a catalog zones issue when a member zone could fail to load.
+
+  A catalog zone's member zone could fail to load in some rare cases,
+  when the internally generated zone configuration string was exceeding
+  512 bytes. That condition only was not enough for the issue to arise,
+  but it was a necessary condition. This could happen, for example, if
+  the catalog zone's default primary servers list contained a large
+  number of items. This has been fixed. :gl:`#5658`
+
+- Allow glue in delegations with QTYPE=ANY.
+
+  When a query for type ANY triggered a delegation response, all
+  additional data was omitted from the response, including mandatory
+  glue. This has been corrected. :gl:`#5659`
+
+- Adding NSEC3 opt-out records could leave invalid records in chain.
+
+  When creating an NSEC3 opt-out chain, a node in the chain could be
+  removed too soon, causing the previous NSEC3 being unable to be found,
+  resulting in invalid NSEC3 records to be left in the zone. This has
+  been fixed. :gl:`#5671`
+
+- Fix slow speed of NSEC3 optout large delegation zone signing.
+
+  BIND 9.20 takes much more time signing a large delegation zone with
+  NSEC3 optout compared to version 9.18. This has been restored.
+  :gl:`#5672`
+
+- Reconfigure NSEC3 opt-out zone to NSEC causes zone to be invalid.
+
+  A zone that is signed with NSEC3, opt-out enabled, and then
+  reconfigured to use NSEC, causes the zone to be published with missing
+  NSEC records. This has been fixed. :gl:`#5679`
+
+- Fix a possible catalog zone issue during reconfiguration.
+
+  The :iscman:`named` process could terminate unexpectedly during
+  reconfiguration when a catalog zone update was taking place at the
+  same time. This has been fixed.
+
+- Fix the charts in the statistics channel.
+
+  The charts in the statistics channel could sometimes fail to render in
+  the browser, and were completely disabled for Mozilla-based browsers
+  for historical reasons. This has been fixed.
+
+