diff --git a/src/main/java/org/apache/commons/collections4/list/IndexedLinkedList.java b/src/main/java/org/apache/commons/collections4/list/IndexedLinkedList.java
index bed3542df..3e764c913 100644
--- a/src/main/java/org/apache/commons/collections4/list/IndexedLinkedList.java
+++ b/src/main/java/org/apache/commons/collections4/list/IndexedLinkedList.java
@@ -1,3 +1,19 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.github.coderodde.util;
 
 import java.lang.reflect.Array;
diff --git a/src/test/java/org/apache/commons/collections4/list/FingerListTest.java b/src/test/java/org/apache/commons/collections4/list/FingerListTest.java
index 52153c140..5466c1f73 100644
--- a/src/test/java/org/apache/commons/collections4/list/FingerListTest.java
+++ b/src/test/java/org/apache/commons/collections4/list/FingerListTest.java
@@ -1,3 +1,19 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.github.coderodde.util;
 
 import com.github.coderodde.util.IndexedLinkedList.Finger;
diff --git a/src/test/java/org/apache/commons/collections4/list/IndexedLinkedListTest.java b/src/test/java/org/apache/commons/collections4/list/IndexedLinkedListTest.java
index 5df6cdb29..6425b0667 100644
--- a/src/test/java/org/apache/commons/collections4/list/IndexedLinkedListTest.java
+++ b/src/test/java/org/apache/commons/collections4/list/IndexedLinkedListTest.java
@@ -1,3 +1,19 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.github.coderodde.util;
 
 import com.github.coderodde.util.IndexedLinkedList.BasicIterator;