diff --git a/src/chronochat.cpp b/src/chronochat.cpp
index 523a835..f4742be 100644
--- a/src/chronochat.cpp
+++ b/src/chronochat.cpp
@@ -1,3 +1,13 @@
+/* -*- 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: Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
 #include "chronochat.h"
 #include "ui_chronochat.h"
 
diff --git a/src/chronochat.h b/src/chronochat.h
index 1bf307f..f4eb0fe 100644
--- a/src/chronochat.h
+++ b/src/chronochat.h
@@ -1,3 +1,13 @@
+/* -*- 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: Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
 #ifndef CHRONOCHAT_H
 #define CHRONOCHAT_H
 
diff --git a/src/demo.icns b/src/demo.icns
new file mode 100644
index 0000000..c3661e6
--- /dev/null
+++ b/src/demo.icns
Binary files differ
diff --git a/src/images/icon_large.png b/src/images/icon_large.png
new file mode 100644
index 0000000..b0bde46
--- /dev/null
+++ b/src/images/icon_large.png
Binary files differ
diff --git a/src/images/icon_small.png b/src/images/icon_small.png
new file mode 100644
index 0000000..a9630a8
--- /dev/null
+++ b/src/images/icon_small.png
Binary files differ
diff --git a/src/images/note.png b/src/images/note.png
new file mode 100644
index 0000000..2881ccd
--- /dev/null
+++ b/src/images/note.png
Binary files differ
diff --git a/src/images/refresh.png b/src/images/refresh.png
new file mode 100644
index 0000000..72dd809
--- /dev/null
+++ b/src/images/refresh.png
Binary files differ
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..5fcaaf2
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,30 @@
+/* -*- 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: Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
+#include <QApplication>
+
+#include "chronochat.h"
+
+int main(int argc, char *argv[])
+{
+  QApplication app(argc, argv);
+
+// #ifdef __APPLE__
+// 	app.setWindowIcon(QIcon(":/demo.icns"));
+// #else
+// 	app.setWindowIcon(QIcon(":/images/icon_large.png"));
+// #endif
+
+  ChronoChat dialog;
+
+  dialog.show ();
+  
+  return app.exec();
+}