diff --git a/scripts/enums/HeatSector.py b/scripts/enums/HeatSector.py
index 4c763fec..03bcaffd 100644
--- a/scripts/enums/HeatSector.py
+++ b/scripts/enums/HeatSector.py
@@ -1,4 +1,6 @@
 # -*- coding: utf-8 -*-
+# SPDX-FileCopyrightText: : 2020-2024 The PyPSA-Eur Authors
+#
 # SPDX-License-Identifier: MIT
 
 from enum import Enum