diff --git a/etc/labs/lab20.conf b/etc/labs/lab20.conf
index 5b7bf1f7a..0d9746318 100644
--- a/etc/labs/lab20.conf
+++ b/etc/labs/lab20.conf
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2014-2025 Institute for Automation of Complex Power Systems, RWTH Aachen University
+# SPDX-License-Identifier: Apache-2.0
+
 nodes = {
     tcp_node = {
         type = "socket",