diff --git a/pgpainless-core/src/test/java/org/pgpainless/key/_64DigitFingerprintTest.java b/pgpainless-core/src/test/java/org/pgpainless/key/_64DigitFingerprintTest.java
index 21ff31c3..a38fa61d 100644
--- a/pgpainless-core/src/test/java/org/pgpainless/key/_64DigitFingerprintTest.java
+++ b/pgpainless-core/src/test/java/org/pgpainless/key/_64DigitFingerprintTest.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.key;
 
 import org.bouncycastle.util.encoders.Hex;