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diff --git a/gr-blocks/include/blocks/repack_bits_bb.h b/gr-blocks/include/blocks/repack_bits_bb.h
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+++ b/gr-blocks/include/blocks/repack_bits_bb.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2012 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_BLOCKS_REPACK_BITS_BB_H
+#define INCLUDED_BLOCKS_REPACK_BITS_BB_H
+
+#include <blocks/api.h>
+#include <gr_tagged_stream_block.h>
+
+namespace gr {
+  namespace blocks {
+
+    /*!
+     * \brief Pack \p k bits from the input stream onto \p k bits of the output stream.
+     * \ingroup blocks
+     *
+     * No bits are lost here; any value for k and l (within [1, 8]) is allowed.
+     * On every fresh input byte, it starts reading on the LSB, and starts copying
+     * to the LSB as well.
+     *
+     * If a packet length tag is given, this block assumes a tagged stream.
+     * In this case, the tag with the packet length is updated accordingly.
+     * Also, the number of input bits is padded with zeros if the number of input
+     * bits is not an integer multiple of \p l, or bits are truncated from the input
+     * if \p align_output is set to true.
+     */
+    class BLOCKS_API repack_bits_bb : virtual public gr_tagged_stream_block
+    {
+     public:
+      typedef boost::shared_ptr<repack_bits_bb> sptr;
+
+      /*!
+       * \param k Number of relevant bits on the input stream
+       * \param l Number of relevant bits on the output stream
+       * \param len_tag_key If not empty, this is the key for the length tag.
+       * \param align_output If len_tag_key is given, this controls if the input
+       *                     or the output is aligned.
+       */
+      static sptr make(int k, int l=8, const std::string &len_tag_key="", bool align_output=false);
+    };
+
+  } // namespace blocks
+} // namespace gr
+
+#endif /* INCLUDED_BLOCKS_REPACK_BITS_BB_H */
+