diff --git a/src/test/java/de/neemann/digital/testing/TestExecutorTest.java b/src/test/java/de/neemann/digital/testing/TestExecutorTest.java
index 5e0807116..452b8ac9f 100644
--- a/src/test/java/de/neemann/digital/testing/TestExecutorTest.java
+++ b/src/test/java/de/neemann/digital/testing/TestExecutorTest.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2020 Helmut Neemann
+ * Use of this source code is governed by the GPL v3 license
+ * that can be found in the LICENSE file.
+ */
 package de.neemann.digital.testing;
 
 import de.neemann.digital.core.Model;