diff --git a/external-sop/src/test/java/sop/testsuite/external/ExternalTestSuite.java b/external-sop/src/test/java/sop/testsuite/external/ExternalTestSuite.java
index 6e991cf..aa0ae82 100644
--- a/external-sop/src/test/java/sop/testsuite/external/ExternalTestSuite.java
+++ b/external-sop/src/test/java/sop/testsuite/external/ExternalTestSuite.java
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2025 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package sop.testsuite.external;
 
 import org.junit.platform.suite.api.IncludeClassNamePatterns;