diff --git a/src/treelayout.h b/src/treelayout.h
index 498210c..4942f62 100644
--- a/src/treelayout.h
+++ b/src/treelayout.h
@@ -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>
+ */
+
 #ifndef TREELAYOUT_H
 #define TREELAYOUT_H
 #include <vector>