diff --git a/README.rst b/README.rst
index 92854f631..d10b662d1 100644
--- a/README.rst
+++ b/README.rst
@@ -265,6 +265,8 @@ This software is dual-licensed by New Vector Ltd (Element). It can be used eithe
 
 Unless required by applicable law or agreed to in writing, software distributed under the Licenses is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Licenses for the specific language governing permissions and limitations under the Licenses.
 
+Please contact `licensing@element.io <mailto:licensing@element.io>`_ to purchase an Element commercial license for this software.
+
 
 .. |support| image:: https://img.shields.io/badge/matrix-community%20support-success
   :alt: (get community support in #synapse:matrix.org)
diff --git a/changelog.d/18973.misc b/changelog.d/18973.misc
new file mode 100644
index 000000000..e88fd7479
--- /dev/null
+++ b/changelog.d/18973.misc
@@ -0,0 +1 @@
+Note that the code is additionally licensed under the [Element Commercial license](https://github.com/element-hq/synapse/blob/develop/LICENSE-COMMERCIAL) in SPDX expression field configs.
\ No newline at end of file
diff --git a/debian/changelog b/debian/changelog
index 41d173ce5..6c476674f 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,11 @@
+matrix-synapse-py3 (1.139.0~rc3+nmu1) UNRELEASED; urgency=medium
+
+  * The licensing specifier has been updated to add an optional
+    `LicenseRef-Element-Commercial` license. The code was already licensed in
+    this manner - the debian metadata was just not updated to reflect it.
+
+ -- Synapse Packaging team <packages@matrix.org>  Thu, 25 Sep 2025 12:17:17 +0100
+
 matrix-synapse-py3 (1.139.0~rc3) stable; urgency=medium
 
   * New Synapse release 1.139.0rc3.
diff --git a/debian/copyright b/debian/copyright
index 9e407ce42..9814133ed 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -8,7 +8,7 @@ License: Apache-2.0
 
 Files: *
 Copyright: 2023 New Vector Ltd
-License: AGPL-3.0-or-later
+License: AGPL-3.0-or-later or LicenseRef-Element-Commercial
 
 Files: synapse/config/saml2.py
 Copyright: 2015, Ericsson
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 7a8e57c23..727bc8bf5 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -174,7 +174,7 @@ ARG TARGETARCH
 LABEL org.opencontainers.image.url='https://github.com/element-hq/synapse'
 LABEL org.opencontainers.image.documentation='https://element-hq.github.io/synapse/latest/'
 LABEL org.opencontainers.image.source='https://github.com/element-hq/synapse.git'
-LABEL org.opencontainers.image.licenses='AGPL-3.0-or-later'
+LABEL org.opencontainers.image.licenses='AGPL-3.0-or-later OR LicenseRef-Element-Commercial'
 
 # On the runtime image, /lib is a symlink to /usr/lib, so we need to copy the
 # libraries to the right place, else the `COPY` won't work.
diff --git a/pyproject.toml b/pyproject.toml
index 7f5838608..c9f81850f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -104,7 +104,7 @@ name = "matrix-synapse"
 version = "1.139.0rc3"
 description = "Homeserver for the Matrix decentralised comms protocol"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
-license = "AGPL-3.0-or-later"
+license = "AGPL-3.0-or-later OR LicenseRef-Element-Commercial"
 readme = "README.rst"
 repository = "https://github.com/element-hq/synapse"
 packages = [