diff --git a/libs/CMakeLists.txt b/libs/CMakeLists.txt
index b761b71ffb..306c8ced2f 100644
--- a/libs/CMakeLists.txt
+++ b/libs/CMakeLists.txt
@@ -1,6 +1,8 @@
 # ##############################################################################
 # libs/CMakeLists.txt
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed to the Apache Software Foundation (ASF) under one or more contributor
 # license agreements.  See the NOTICE file distributed with this work for
 # additional information regarding copyright ownership.  The ASF licenses this