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diff --git a/src/fragmentation/fragmentation.h b/src/fragmentation/fragmentation.h
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+/*
+     This file is part of GNUnet
+     (C) 2009, 2011 Christian Grothoff (and other contributing authors)
+
+     GNUnet 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.
+
+     GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+/**
+ * @file src/fragmentation/fragmentation.h
+ * @brief library to help fragment messages
+ * @author Christian Grothoff
+ */
+#ifndef FRAGMENTATION_H
+#define FRAGMENTATION_H
+#include "platform.h"
+#include "gnunet_fragmentation_lib.h"
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Header for a message fragment.  Followed by the
+ * original message.
+ */
+struct FragmentHeader
+{
+
+  /**
+   * Message header.
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Unique fragment ID.
+   */
+  uint32_t fragment_id;
+
+  /**
+   * Total message size of the original message.
+   */
+  uint16_t total_size;
+
+  /**
+   * Absolute offset (in bytes) of this fragment in the original
+   * message.  Will be a multiple of the MTU.
+   */
+  uint16_t offset;
+
+};
+
+
+/**
+ * Message fragment acknowledgement.
+ */
+struct FragmentAcknowledgement
+{
+
+  /**
+   * Message header.
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Unique fragment ID.
+   */
+  uint32_t fragment_id;
+
+  /**
+   * Bits that are being acknowledged, in big-endian.
+   * (bits that are set correspond to fragments that
+   * have not yet been received).
+   */
+  uint64_t bits;
+
+};
+GNUNET_NETWORK_STRUCT_END
+
+#endif