diff --git a/README.md b/README.md
index e340fb9..fbe6879 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ Welcome to the Solr Mongo Importer project. This project provides MongoDb suppor
 * Retrive data from a MongoDb collection
 * Authenticate using MongoDb authentication
 * Map Mongo fields to Solr fields
+* Delta import available
 
 ## Classes
 
@@ -17,6 +18,8 @@ Welcome to the Solr Mongo Importer project. This project provides MongoDb suppor
 * MongoEntityProcessor - Use with the MongoDataSource to query a MongoDb collection
     * collection (**required**)
     * query (**required**)
+    * deltaQuery (*optional*)
+    * deltaImportQuery (*optional*)
 * MongoMapperTransformer - Map MongoDb fields to your Solr schema
     * mongoField (**required**)
 
@@ -46,6 +49,8 @@ Here is a sample data-config.xml showing the use of all components
                  query="{'Active':1}"
                  collection="ProductData"
                  datasource="MyMongo"
+                 deltaQuery="{'UpdateDate':{$gt:{$date:'${dih.last_index_time}'}}}"
+                 deltaImportQuery="{'_id':'${dih.delta._id}'}"
                  transformer="MongoMapperTransformer" >
              <field column="title"           name="title"       mongoField="Title"/>
              <field column="description"     name="description" mongoField="Long Description"/>
diff --git a/src/main/org/apache/solr/handler/dataimport/MongoEntityProcessor.java b/src/main/org/apache/solr/handler/dataimport/MongoEntityProcessor.java
index 91b6bce..5830fd8 100644
--- a/src/main/org/apache/solr/handler/dataimport/MongoEntityProcessor.java
+++ b/src/main/org/apache/solr/handler/dataimport/MongoEntityProcessor.java
@@ -3,7 +3,6 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.Iterator;
 import java.util.Map;
 
 import static org.apache.solr.handler.dataimport.DataImportHandlerException.SEVERE;
@@ -49,13 +48,72 @@ protected void initQuery(String q) {
 
     @Override
     public Map<String, Object> nextRow() {
-        String query = context.getEntityAttribute( QUERY );
         if (rowIterator == null) {
+            String query = this.getQuery();
             initQuery(context.replaceTokens(query));
+
+        }
+        return getNext();
+    }
+
+    @Override
+    public Map<String, Object> nextModifiedRowKey() {
+        if (rowIterator == null) {
+            String deltaQuery = context.getEntityAttribute(DELTA_QUERY);
+            if(deltaQuery == null)
+                return null;
+            initQuery(context.replaceTokens(deltaQuery));
+
         }
         return getNext();
     }
 
+    @Override
+    public Map<String, Object> nextDeletedRowKey() {
+        if (rowIterator == null) {
+            String deletedPkQuery = context.getEntityAttribute(DEL_PK_QUERY);
+            if(deletedPkQuery == null)
+                return null;
+            initQuery(context.replaceTokens(deletedPkQuery));
+        }
+        return getNext();
+    }
+
+    @Override
+    public Map<String, Object> nextModifiedParentRowKey() {
+        if(this.rowIterator == null) {
+            String parentDeltaQuery = this.context.getEntityAttribute("parentDeltaQuery");
+            if(parentDeltaQuery == null) {
+                return null;
+            }
+
+            LOG.info("Running parentDeltaQuery for Entity: " + this.context.getEntityAttribute("name"));
+            this.initQuery(this.context.replaceTokens(parentDeltaQuery));
+        }
+
+        return this.getNext();
+    }
+
+    public String getQuery() {
+        String queryString = this.context.getEntityAttribute(QUERY);
+        if("FULL_DUMP".equals(this.context.currentProcess())) {
+            return queryString;
+        } else if("DELTA_DUMP".equals(this.context.currentProcess())) {
+            return this.context.getEntityAttribute(DELTA_IMPORT_QUERY);
+
+        } else {
+            return null;
+        }
+    }
+
+
     public static final String QUERY      = "query";
+
+    public static final String DELTA_QUERY = "deltaQuery";
+
+    public static final String DELTA_IMPORT_QUERY = "deltaImportQuery";
+
+    public static final String DEL_PK_QUERY = "deletedPkQuery";
+
     public static final String COLLECTION = "collection";
 }