diff --git a/src/test/java/de/neemann/digital/builder/tt2/RotationByteArrayOutputStreamTest.java b/src/test/java/de/neemann/digital/builder/tt2/RotationByteArrayOutputStreamTest.java
index 482f7b5c6..95011f30e 100644
--- a/src/test/java/de/neemann/digital/builder/tt2/RotationByteArrayOutputStreamTest.java
+++ b/src/test/java/de/neemann/digital/builder/tt2/RotationByteArrayOutputStreamTest.java
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2019 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.builder.tt2;
 
 import junit.framework.TestCase;