diff --git a/tests/unit-tests/util/segment-fetcher.cpp b/tests/unit-tests/util/segment-fetcher.cpp
index d19e327..b0884eb 100644
--- a/tests/unit-tests/util/segment-fetcher.cpp
+++ b/tests/unit-tests/util/segment-fetcher.cpp
@@ -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) 2013-2015 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
diff --git a/tests/unit-tests/util/signal.cpp b/tests/unit-tests/util/signal.cpp
index d168cf5..f538629 100644
--- a/tests/unit-tests/util/signal.cpp
+++ b/tests/unit-tests/util/signal.cpp
@@ -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) 2013-2015 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -17,9 +17,6 @@
  * <http://www.gnu.org/licenses/>.
  *
  * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
- *
- * This code is actually copied from NFD project (NDN Forwarding Daemon).
- * We acknowledge the permission of the authors of NFD.
  */
 
 #include "util/signal.hpp"
diff --git a/tests/unit-tests/util/test-io.cpp b/tests/unit-tests/util/test-io.cpp
index b857a4a..0a3e422 100644
--- a/tests/unit-tests/util/test-io.cpp
+++ b/tests/unit-tests/util/test-io.cpp
@@ -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) 2013-2015 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *