diff --git a/src/digesttreescene.cpp b/src/digesttreescene.cpp
index ba45af8..5c785e6 100644
--- a/src/digesttreescene.cpp
+++ b/src/digesttreescene.cpp
@@ -1,3 +1,14 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *                     Yingdi Yu
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
 #include "digesttreescene.h"
 
 #include <QtGui>