diff --git a/contrib/dataimporthandler/CHANGES.txt b/contrib/dataimporthandler/CHANGES.txt
index a7293c89921..9952456c0e8 100644
--- a/contrib/dataimporthandler/CHANGES.txt
+++ b/contrib/dataimporthandler/CHANGES.txt
@@ -35,6 +35,8 @@ New Features
 
 * SOLR-1678 :  Move onError handling to DIH framework (noble)
 
+* SOLR-1352 : Multi-threaded implementation of DIH (noble)
+
 
 Optimizations
 ----------------------
diff --git a/contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/ThreadedContext.java b/contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/ThreadedContext.java
index 0b72ecd3cc6..66fab3e107b 100644
--- a/contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/ThreadedContext.java
+++ b/contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/ThreadedContext.java
@@ -1,7 +1,27 @@
+/**
+ * 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 org.apache.solr.handler.dataimport;
 
 
-
+/**Context implementation used when run multi threaded.
+ *
+ * @since Solr 1.5
+ * 
+ */
 public class ThreadedContext extends ContextImpl{
   private DocBuilder.EntityRunner entityRunner;
   private boolean limitedContext = false;
diff --git a/contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/ThreadedEntityProcessorWrapper.java b/contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/ThreadedEntityProcessorWrapper.java
index 823da9d3faa..7c82843ab12 100644
--- a/contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/ThreadedEntityProcessorWrapper.java
+++ b/contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/ThreadedEntityProcessorWrapper.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 org.apache.solr.handler.dataimport;
 
 import static org.apache.solr.handler.dataimport.EntityProcessorBase.ON_ERROR;
@@ -14,6 +30,7 @@ import java.util.Collections;
 /**
  * Each Entity may have only a single EntityProcessor .  But the same entity can be run by
  * multiple EntityProcessorWrapper (1 per thread) . thhis helps running transformations in multiple threads
+ * @since Solr 1.5
  */
 
 public class ThreadedEntityProcessorWrapper extends EntityProcessorWrapper {
diff --git a/contrib/dataimporthandler/src/test/java/org/apache/solr/handler/dataimport/TestThreaded.java b/contrib/dataimporthandler/src/test/java/org/apache/solr/handler/dataimport/TestThreaded.java
index 1fdbe47377f..daa6f6e80fc 100644
--- a/contrib/dataimporthandler/src/test/java/org/apache/solr/handler/dataimport/TestThreaded.java
+++ b/contrib/dataimporthandler/src/test/java/org/apache/solr/handler/dataimport/TestThreaded.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 org.apache.solr.handler.dataimport;
 
 import org.junit.Test;