diff --git a/lib/chunkRequireTree.js b/lib/chunkRequireTree.js
index 14f88f8..2c8e630 100644
--- a/lib/chunkRequireTree.js
+++ b/lib/chunkRequireTree.js
@@ -1,3 +1,5 @@
+var path = require("path");
+
 function pushChunk(item,sameAsChunkMap,into) {
 	var s = sameAsChunkMap[item.filePath];
 	if (s) {
@@ -10,6 +12,34 @@ function pushChunk(item,sameAsChunkMap,into) {
 	}
 }
 
+function chunkIdxToUrl(idx,urlDest) {
+	if (idx === 0) {
+		return urlDest;
+	}
+	
+	var urlDir = path.dirname(urlDest);
+	var urlExt = path.extname(urlDest);
+	var urlBase = path.basename(urlDest,urlExt);
+	
+	if (urlBase + urlExt === urlDest) {
+		var srcBefore = urlBase;
+	} else {
+		var srcBefore = urlDir+"/"+urlBase;
+	}
+	
+	return srcBefore + idx + urlExt;
+}
+
+function chunkIdxToFilePath(idx,dest) {
+	if (idx === 0) {
+		return dest;
+	}
+	var dir = path.dirname(dest);
+	var ext = path.extname(dest);
+	var base = path.basename(dest,ext);
+	return (dir + path.sep + base + idx + ext);
+}
+
 function map(node,into) {
 	into = into || {};
 	if (!into.hasOwnProperty(node.filePath)) {
@@ -43,18 +73,22 @@ function getSameAsChunkMap(mappings) {
 	return sameAsChunkMap;
 }
 
-function chunkRequireTree(tree) {
+function chunkRequireTree(tree,urlDest,dest) {
 	var mappings = map(tree);
 	var sameAsChunkMap = getSameAsChunkMap(mappings);
 	
 	var keys;
 	var chunks = [];
+	var idx = 0;
 	while(keys = Object.keys(sameAsChunkMap), keys.length) {
 		var into = [];
-		chunks.push(into);
+		idx = chunks.push({
+			modules:into,
+			urlDest:chunkIdxToUrl(idx,urlDest),
+			fileDest:chunkIdxToFilePath(idx,dest)
+		});
 		pushChunk(mappings[keys[0]],sameAsChunkMap,into);
 	}
-	
 	return chunks;
 }
 
diff --git a/lib/webant.js b/lib/webant.js
index 77e46e3..e9ae92e 100644
--- a/lib/webant.js
+++ b/lib/webant.js
@@ -15,7 +15,7 @@ function webant(config,callback) {
 	}
 	
 	webant.getRequireTree(settings.entry,settings,function(err,tree){
-		var chunks = webant.chunkRequireTree(tree);
+		var chunks = webant.chunkRequireTree(tree,settings.urlDest,settings.dest);
 		webant.write(stringifyChunks(chunks,settings),callback);
 	});
 }