diff --git a/pgpainless-core/src/test/java/org/pgpainless/key/modification/KeyCleanerTest.java b/pgpainless-core/src/test/java/org/pgpainless/key/modification/KeyCleanerTest.java
index 28d79e83..aaff0345 100644
--- a/pgpainless-core/src/test/java/org/pgpainless/key/modification/KeyCleanerTest.java
+++ b/pgpainless-core/src/test/java/org/pgpainless/key/modification/KeyCleanerTest.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.key.modification;
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;