diff --git a/src/tree-layout.hpp b/src/tree-layout.hpp
index 514b1ed..b180b83 100644
--- a/src/tree-layout.hpp
+++ b/src/tree-layout.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
 /*
- * Copyright (c) 2013, Regents of the University of California
+ * Copyright (c) 2020, Regents of the University of California
  *                     Yingdi Yu
  *
  * BSD license, See the LICENSE file for more information