--- a/src/treecms/proto/test/SimpleEditorTest2.java	Tue Nov 09 18:13:54 2010 +0900
+++ b/src/treecms/proto/test/SimpleEditorTest2.java	Wed Nov 10 00:36:51 2010 +0900
@@ -1,5 +1,12 @@
 package treecms.proto.test;
 
+/**
+ * SimpleEditorTest2
+ * 
+ * testMultiThread
+ *  test concurrent monotonic-tree modification 
+ */
+
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Random;
@@ -50,7 +57,7 @@
 	@Test
 	public void testMultiThread()
 	{
-		int threads = 10;
+		int threads = 10; //number of threads.
 		final int modifyCount = 100;
 		ExecutorService service = Executors.newFixedThreadPool(threads);
 		
@@ -60,18 +67,26 @@
 				@Override
 				public void run()
 				{
-					// TODO Auto-generated method stub
 					SimpleEditor editor = new SimpleEditor(m_contents);
 					Random random = new Random();
 					
 					for(int i = 0;i < modifyCount;i ++){
 						List<Node> nodeList = transform(new PreOrderTreeWalker(m_contents.get()));
+						
+						//get random target from nodelist
 						Node target = nodeList.get(Math.abs(random.nextInt(nodeList.size())));
+						
+						//edit target
 						editor.edit(target);
-						editor.commit(false);
+						
+						//force commit.
+						editor.commit(true);
 					}
 				}
 				
+				/*
+				 * convert iterator to list
+				 */
 				public List<Node> transform(PreOrderTreeWalker _walker)
 				{
 					LinkedList<Node> nodeList = new LinkedList<Node>();