diff --git a/design-patterns/builder.html b/design-patterns/builder.html
index b06662a..52a4741 100644
--- a/design-patterns/builder.html
+++ b/design-patterns/builder.html
@@ -23,6 +23,11 @@
console.log('Requested Beer: '+beer);
});
}
+
+// reference
+// http://www.jspatterns.com/
+// http://shop.oreilly.com/product/9780596806767.do?sortby=publicationDate
+// http://www.addyosmani.com/resources/essentialjsdesignpatterns/book/