diff --git a/synapse/events/__init__.py b/synapse/events/__init__.py
index 92b406e336..7ec696c6c0 100644
--- a/synapse/events/__init__.py
+++ b/synapse/events/__init__.py
@@ -1,6 +1,8 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2020 The Matrix.org Foundation C.I.C.
+# Copyright 2014-2016 OpenMarket Ltd
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/synapse/events/builder.py b/synapse/events/builder.py
index f32449c7da..10ef01131b 100644
--- a/synapse/events/builder.py
+++ b/synapse/events/builder.py
@@ -1,6 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2014-2016 OpenMarket Ltd
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/synapse/events/presence_router.py b/synapse/events/presence_router.py
index 2bb7b0ae74..9cb053cd8e 100644
--- a/synapse/events/presence_router.py
+++ b/synapse/events/presence_router.py
@@ -1,6 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2021 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/synapse/events/snapshot.py b/synapse/events/snapshot.py
index c8fe6a9b2e..6b70ea94d1 100644
--- a/synapse/events/snapshot.py
+++ b/synapse/events/snapshot.py
@@ -1,6 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2014-2016 OpenMarket Ltd
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/synapse/events/utils.py b/synapse/events/utils.py
index cb7ebc31e7..cc52d0d1e9 100644
--- a/synapse/events/utils.py
+++ b/synapse/events/utils.py
@@ -1,6 +1,8 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2021 The Matrix.org Foundation C.I.C.
+# Copyright 2014-2016 OpenMarket Ltd
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/synapse/events/validator.py b/synapse/events/validator.py
index 9c17ad7a23..62f0b67dbd 100644
--- a/synapse/events/validator.py
+++ b/synapse/events/validator.py
@@ -1,6 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2014-2016 OpenMarket Ltd
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
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