diff --git a/src/tlv-nlsr.hpp b/src/tlv-nlsr.hpp
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+++ b/src/tlv-nlsr.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2020,  The University of Memphis,
+ *                           Regents of the University of California,
+ *                           Arizona Board of Regents.
+ *
+ * This file is part of NLSR (Named-data Link State Routing).
+ * See AUTHORS.md for complete list of NLSR authors and contributors.
+ *
+ * NLSR is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NLSR is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NLSR_TLV_NLSR_HPP
+#define NLSR_TLV_NLSR_HPP
+
+#include <ndn-cxx/encoding/tlv.hpp>
+
+namespace ndn {
+namespace tlv {
+namespace nlsr {
+
+/*! The TLV block types that NLSR uses to encode/decode LSA types. The
+ *  way NLSR encodes LSAs to TLV is by encoding each element of the
+ *  LSA as a separate TLV block. So, block types are needed. These are
+ *  used in the LSDB Status Dataset.
+ */
+enum {
+  Lsa                         = 128,
+  SequenceNumber              = 130,
+  AdjacencyLsa                = 131,
+  Adjacency                   = 132,
+  CoordinateLsa               = 133,
+  CostDouble                  = 134,
+  HyperbolicRadius            = 135,
+  HyperbolicAngle             = 136,
+  NameLsa                     = 137,
+  LsdbStatus                  = 138,
+  ExpirationTime              = 139,
+  Cost                        = 140,
+  Uri                         = 141,
+  NextHop                     = 143,
+  RoutingTable                = 144,
+  RoutingTableEntry           = 145
+};
+
+} // namespace nlsr
+} // namespace tlv
+} // namespace ndn
+
+#endif // NLSR_TLV_NLSR_HPP