diff --git a/tests/test_physics/test_triples.py b/tests/test_physics/test_triples.py
index 79c5f1567..8b6f1fc34 100644
--- a/tests/test_physics/test_triples.py
+++ b/tests/test_physics/test_triples.py
@@ -1,13 +1,23 @@
+# Copyright 2023 Xanadu Quantum Technologies Inc.
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 import numpy as np
 import pytest
 
 from mrmustard import math
 from mrmustard.physics import triples
 
-"""
-Tests the Bargmann triples.
-"""
-
 
 # pylint: disable = missing-function-docstring
 class TestTriples: