diff --git a/benchs/distributed_ondisk/distributed_query_demo.py b/benchs/distributed_ondisk/distributed_query_demo.py
index 2e4c4e911d..401f056056 100644
--- a/benchs/distributed_ondisk/distributed_query_demo.py
+++ b/benchs/distributed_ondisk/distributed_query_demo.py
@@ -1,3 +1,7 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
 import os
 import faiss
 import numpy as np