diff --git a/tools/chunks/catchunks/discover-version-fixed.hpp b/tools/chunks/catchunks/discover-version-fixed.hpp
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+++ b/tools/chunks/catchunks/discover-version-fixed.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2016,  Regents of the University of California,
+ *                      Colorado State University,
+ *                      University Pierre & Marie Curie, Sorbonne University.
+ *
+ * This file is part of ndn-tools (Named Data Networking Essential Tools).
+ * See AUTHORS.md for complete list of ndn-tools authors and contributors.
+ *
+ * ndn-tools 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.
+ *
+ * ndn-tools 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
+ * ndn-tools, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ *
+ * @author Andrea Tosatto
+ */
+
+#ifndef NDN_TOOLS_CHUNKS_CATCHUNKS_DISCOVER_VERSION_FIXED_HPP
+#define NDN_TOOLS_CHUNKS_CATCHUNKS_DISCOVER_VERSION_FIXED_HPP
+
+#include "discover-version.hpp"
+
+namespace ndn {
+namespace chunks {
+
+/**
+ * @brief Service to retrieve a specific version segment. The version is specified in the prefix
+ *
+ * Send a request of a specific version and expect to be answered with one segment.
+ *
+ * The received name component after version can be an invalid segment number, this component will
+ * be excluded in the next interests. In the unlikely case that there are too many excluded
+ * components such that the Interest cannot fit in ndn::MAX_NDN_PACKET_SIZE, the discovery
+ * procedure will throw Face::Error.
+ *
+ * DiscoverVersionFixed's user is notified once after one segment with the user specified version
+ * is found or on failure to find any Data version.
+ */
+class DiscoverVersionFixed : public DiscoverVersion
+{
+
+public:
+  /**
+   * @brief create a DiscoverVersionSpecified service
+   */
+  DiscoverVersionFixed(const Name& prefix, Face& face, const Options& options);
+
+  /**
+   * @brief identify the latest Data version published.
+   */
+  void
+  run() NDN_CXX_DECL_FINAL;
+
+private:
+  void
+  handleData(const Interest& interest, const Data& data) NDN_CXX_DECL_FINAL;
+
+private:
+  Exclude m_strayExcludes;
+};
+
+} // namespace chunks
+} // namespace ndn
+
+#endif // NDN_TOOLS_CHUNKS_CATCHUNKS_DISCOVER_VERSION_FIXED_HPP