diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/ChangeSet.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/ChangeSet.java
index 6d98600af..fdb6a2b9e 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/ChangeSet.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/ChangeSet.java
@@ -5,8 +5,6 @@ package edu.cornell.mannlib.vitro.webapp.rdfservice;
 import java.io.InputStream;
 import java.util.List;
 
-import edu.cornell.mannlib.vitro.webapp.rdfservice.ModelChange.Operation;
-
 /*
  * Input parameter to changeSetUpdate() method in RDFService.
  * Represents a precondition query and an ordered list of model changes. 
@@ -14,28 +12,78 @@ import edu.cornell.mannlib.vitro.webapp.rdfservice.ModelChange.Operation;
 
 public interface ChangeSet {
 		
+	/**   
+	 * Getter for the precondition query
+	 * 
+	 * @return String - a SPARQL query            
+	 */	
 	public String getPreconditionQuery();
 	
+	/**   
+	 * Setter for the precondition query
+	 * 
+	 * @param String - a SPARQL query            
+	 */	
 	public void setPreconditionQuery(String preconditionQuery);
 	
+	/**   
+	 * Getter for the precondition query type
+	 * 
+	 * @return RDFService.SPARQLQueryType - the precondition query type           
+	 */	
 	public RDFService.SPARQLQueryType getPreconditionQueryType();
 	
+	/**   
+	 * Setter for the precondition query type
+	 * 
+	 * @param RDFService.SPARQLQueryType - the precondition query type           
+	 */	
 	public void setPreconditionQueryType(RDFService.SPARQLQueryType queryType);
 
+	/**   
+	 * Getter for the list of model changes
+	 * 
+	 * @return List<ModelChange> - list of model changes           
+	 */		
 	public List<ModelChange> getModelChanges();
 	
+	/**   
+	 * Adds one model change representing an addition to the list of model changes
+	 * 
+	 * @param InputStream - a serialized RDF model (collection of triples)  
+	 * @param RDFService.ModelSerializationFormat - format of the serialized RDF model
+	 * @param String - URI of the graph to which the RDF model should be added         
+	 */		
 	public void addAddition(InputStream model, 
 			                RDFService.ModelSerializationFormat format,
 			                String graphURI);
 	
+	/**   
+	 * Adds one model change representing a deletion to the list of model changes
+	 * 
+	 * @param InputStream - a serialized RDF model (collection of triples)  
+	 * @param RDFService.ModelSerializationFormat - format of the serialized RDF model
+	 * @param String - URI of the graph from which the RDF model should be removed         
+	 */		
 	public void addRemoval(InputStream model,
 			               RDFService.ModelSerializationFormat format,
 			               String graphURI);
-	    
+
+	/**   
+	 * Creates an instance of the ModelChange class 
+	 */		
 	public ModelChange manufactureModelChange();
 	
+	/**   
+	 * Creates an instance of the ModelChange class
+	 * 
+	 * @param InputStream - a serialized RDF model (collection of triples)  
+	 * @param RDFService.ModelSerializationFormat - format of the serialized RDF model
+	 * @param ModelChange.Operation - the type of operation to be performed with the serialized RDF model 
+	 * @param String - URI of the graph on which to apply the model change operation        
+	 */		
 	public ModelChange manufactureModelChange(InputStream serializedModel,
                                               RDFService.ModelSerializationFormat serializationFormat,
-                                              Operation operation,
+                                              ModelChange.Operation operation,
                                               String graphURI);
 }
diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/ChangeSetImpl.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/ChangeSetImpl.java
index 1b1753cad..52f92ab75 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/ChangeSetImpl.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/ChangeSetImpl.java
@@ -25,46 +25,96 @@ public class ChangeSetImpl implements ChangeSet {
 	private RDFService.SPARQLQueryType queryType;
 	private ArrayList<ModelChange> modelChanges;
 	
+	/**   
+	 * Getter for the precondition query
+	 * 
+	 * @return String - a SPARQL query            
+	 */	
 	@Override
 	public String getPreconditionQuery() {
 	   return preconditionQuery;	
 	}
 	
+	/**   
+	 * Setter for the precondition query
+	 * 
+	 * @param String - a SPARQL query            
+	 */	
 	@Override
 	public void setPreconditionQuery(String preconditionQuery) {
 		this.preconditionQuery = preconditionQuery;
 	}
 	
+	/**   
+	 * Getter for the precondition query type
+	 * 
+	 * @return RDFService.SPARQLQueryType - the precondition query type           
+	 */	
 	@Override
 	public RDFService.SPARQLQueryType getPreconditionQueryType() {
 		return queryType;
 	}
 	
+	/**   
+	 * Setter for the precondition query type
+	 * 
+	 * @param RDFService.SPARQLQueryType - the precondition query type           
+	 */	
 	@Override
 	public void setPreconditionQueryType(RDFService.SPARQLQueryType queryType) {
 		this.queryType = queryType;
 	}
 
+	/**   
+	 * Getter for the list of model changes
+	 * 
+	 * @return List<ModelChange> - list of model changes           
+	 */	
 	@Override
 	public List<ModelChange> getModelChanges() {
 	    	return modelChanges;
 	}
 	
+	/**   
+	 * Adds one model change representing an addition to the list of model changes
+	 * 
+	 * @param InputStream - a serialized RDF model (collection of triples)  
+	 * @param RDFService.ModelSerializationFormat - format of the serialized RDF model
+	 * @param String - URI of the graph to which the RDF model should be added         
+	 */		
 	@Override
 	public void addAddition(InputStream model, RDFService.ModelSerializationFormat format, String graphURI) {
 		modelChanges.add(manufactureModelChange(model,format, ModelChange.Operation.ADD, graphURI));
 	}
 	
+	/**   
+	 * Adds one model change representing a deletion to the list of model changes
+	 * 
+	 * @param InputStream - a serialized RDF model (collection of triples)  
+	 * @param RDFService.ModelSerializationFormat - format of the serialized RDF model
+	 * @param String - URI of the graph from which the RDF model should be removed         
+	 */		
 	@Override
 	public void addRemoval(InputStream model, RDFService.ModelSerializationFormat format, String graphURI) {
 		modelChanges.add(manufactureModelChange(model, format, ModelChange.Operation.REMOVE, graphURI));
 	}
 	
+	/**   
+	 * Creates an instance of the ModelChange class 
+	 */	
 	@Override
 	public ModelChange manufactureModelChange() {
 		return new ModelChangeImpl(); 
 	}
-	
+
+	/**   
+	 * Creates an instance of the ModelChange class
+	 * 
+	 * @param InputStream - a serialized RDF model (collection of triples)  
+	 * @param RDFService.ModelSerializationFormat - format of the serialized RDF model
+	 * @param ModelChange.Operation - the type of operation to be performed with the serialized RDF model 
+	 * @param String - URI of the graph on which to apply the model change operation        
+	 */		
 	@Override
 	public ModelChange manufactureModelChange(InputStream serializedModel,
                                               RDFService.ModelSerializationFormat serializationFormat,
diff --git a/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/RDFServiceImpl.java b/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/RDFServiceImpl.java
index 4e127b9f2..055200ef2 100644
--- a/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/RDFServiceImpl.java
+++ b/webapp/src/edu/cornell/mannlib/vitro/webapp/rdfservice/impl/RDFServiceImpl.java
@@ -57,7 +57,13 @@ public class RDFServiceImpl implements RDFService {
 	
     /**
      * Returns an RDFService for a remote repository 
-     * @param endpointURI
+     * @param String - URI of the SPARQL endpoint for the knowledge base
+     * @param String - URI of the default write graph within the knowledge base.
+     *                   this is the graph that will be written to when a graph
+     *                   is not explicitly specified.
+     * 
+     * The default read graph is the union of all graphs in the
+     * knowledge base
      */
     public RDFServiceImpl(String endpointURI, String defaultWriteGraphURI) {
         this.endpointURI = endpointURI;