diff --git a/lucene/src/java/org/apache/lucene/index/IndexNotFoundException.java b/lucene/src/java/org/apache/lucene/index/IndexNotFoundException.java
index c2468a7e9a1..5e7107448b8 100644
--- a/lucene/src/java/org/apache/lucene/index/IndexNotFoundException.java
+++ b/lucene/src/java/org/apache/lucene/index/IndexNotFoundException.java
@@ -1,5 +1,22 @@
 package org.apache.lucene.index;
 
+/**
+ * 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.
+ */
+
 import java.io.FileNotFoundException;
 
 /**