diff --git a/qlib/portfolio/__init__.py b/qlib/portfolio/__init__.py
index 139597f9c..b7c525821 100644
--- a/qlib/portfolio/__init__.py
+++ b/qlib/portfolio/__init__.py
@@ -1,2 +1,3 @@
-
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.