diff --git a/build_options.env b/build_options.env
index 04979f717..40d7f1473 100644
--- a/build_options.env
+++ b/build_options.env
@@ -1,2 +1,4 @@
+# SPDX-FileCopyrightText: 2014-2024 Institute for Automation of Complex Power Systems, RWTH Aachen University
+# SPDX-License-Identifier: Apache-2.0
 # build_options.env
 CMAKE_OPTS="-DWITH_NODE_SOCKET=ON -DWITH_NODE_SIGNAL=ON"