diff --git a/src/util/signal.hpp b/src/util/signal.hpp
index cd36b5d..12f2247 100644
--- a/src/util/signal.hpp
+++ b/src/util/signal.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2013-2014 Regents of the University of California.
+/*
+ * Copyright (c) 2013-2017 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -22,9 +22,9 @@
 #ifndef NDN_UTIL_SIGNAL_HPP
 #define NDN_UTIL_SIGNAL_HPP
 
-#include "signal-signal.hpp"
-#include "signal-emit.hpp"
-#include "signal-connection.hpp"
-#include "signal-scoped-connection.hpp"
+#include "signal/signal.hpp"
+#include "signal/emit.hpp"
+#include "signal/connection.hpp"
+#include "signal/scoped-connection.hpp"
 
 #endif // NDN_UTIL_SIGNAL_HPP