diff --git a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Label.java b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Label.java
index 33664dd..b46862e 100644
--- a/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Label.java
+++ b/core/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Label.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de>
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
 package eu.mulk.quarkus.googlecloud.jsonlogging;
 
 import java.util.Objects;