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diff --git a/gr-blocks/include/blocks/udp_sink.h b/gr-blocks/include/blocks/udp_sink.h
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+++ b/gr-blocks/include/blocks/udp_sink.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2007-2010,2013 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GR_UDP_SINK_H
+#define INCLUDED_GR_UDP_SINK_H
+
+#include <blocks/api.h>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace blocks {
+
+    /*!
+     * \brief Write stream to an UDP socket.
+     * \ingroup sink_blk
+     */
+    class BLOCKS_API udp_sink : virtual public gr_sync_block
+    {
+    public:
+      // gr::blocks::udp_sink::sptr
+      typedef boost::shared_ptr<udp_sink> sptr;
+
+      /*!
+       * \brief UDP Sink Constructor
+       *
+       * \param itemsize     The size (in bytes) of the item datatype
+       * \param host         The name or IP address of the receiving host; use
+       *                     NULL or None for no connection
+       * \param port         Destination port to connect to on receiving host
+       * \param payload_size UDP payload size by default set to
+       *                     1472 = (1500 MTU - (8 byte UDP header) - (20 byte IP header))
+       * \param eof          Send zero-length packet on disconnect
+       */
+      static sptr make(size_t itemsize,
+                       const std::string &host, int port,
+                       int payload_size=1472, bool eof=true);
+
+      /*! \brief return the PAYLOAD_SIZE of the socket */
+      virtual int payload_size() = 0;
+
+      /*! \brief Change the connection to a new destination
+       *
+       * \param host         The name or IP address of the receiving host; use
+       *                     NULL or None to break the connection without closing
+       * \param port         Destination port to connect to on receiving host
+       *
+       * Calls disconnect() to terminate any current connection first.
+       */
+      virtual void connect(const std::string &host, int port) = 0;
+
+      /*! \brief Send zero-length packet (if eof is requested) then stop sending
+       *
+       * Zero-byte packets can be interpreted as EOF by gr_udp_source.
+       * Note that disconnect occurs automatically when the sink is
+       * destroyed, but not when its top_block stops.*/
+      virtual void disconnect() = 0;
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_UDP_SINK_H */