diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py
index e99e115ff2..3051b623d0 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -1,6 +1,8 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2022 The Matrix.org Foundation C.I.C.
+# Copyright 2015, 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/metrics/_gc.py b/synapse/metrics/_gc.py
index 4733d4caeb..d16481a0f6 100644
--- a/synapse/metrics/_gc.py
+++ b/synapse/metrics/_gc.py
@@ -1,6 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2015-2022 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/metrics/_reactor_metrics.py b/synapse/metrics/_reactor_metrics.py
index 4d7a3d4afc..c0a4ee16ee 100644
--- a/synapse/metrics/_reactor_metrics.py
+++ b/synapse/metrics/_reactor_metrics.py
@@ -1,6 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2022 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/metrics/_twisted_exposition.py b/synapse/metrics/_twisted_exposition.py
index 4fcd394c0d..9652ca83fb 100644
--- a/synapse/metrics/_twisted_exposition.py
+++ b/synapse/metrics/_twisted_exposition.py
@@ -1,6 +1,8 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2019 Matrix.org Foundation C.I.C.
+# Copyright 2015-2019 Prometheus Python Client Developers
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/synapse/metrics/_types.py b/synapse/metrics/_types.py
index 864aae5041..cbfe71446e 100644
--- a/synapse/metrics/_types.py
+++ b/synapse/metrics/_types.py
@@ -1,6 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2022 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/metrics/common_usage_metrics.py b/synapse/metrics/common_usage_metrics.py
index 4302e7dc2c..970367e9e0 100644
--- a/synapse/metrics/common_usage_metrics.py
+++ b/synapse/metrics/common_usage_metrics.py
@@ -1,6 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2022 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/metrics/jemalloc.py b/synapse/metrics/jemalloc.py
index 9b08c6addf..6b4c64f7a5 100644
--- a/synapse/metrics/jemalloc.py
+++ b/synapse/metrics/jemalloc.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
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