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diff --git a/gr-digital/include/gnuradio/digital/diff_encoder_bb.h b/gr-digital/include/gnuradio/digital/diff_encoder_bb.h
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+++ b/gr-digital/include/gnuradio/digital/diff_encoder_bb.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2012 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_GR_DIFF_ENCODER_BB_H
+#define INCLUDED_GR_DIFF_ENCODER_BB_H
+
+#include <gnuradio/digital/api.h>
+#include <gnuradio/sync_block.h>
+
+namespace gr {
+  namespace digital {
+
+    /*!
+     * \brief Differential decoder: y[0] = (x[0] + y[-1]) % M
+     * \ingroup symbol_coding_blk
+     *
+     * \details
+     * Uses current and previous symbols and the alphabet modulus to
+     * perform differential encoding.
+     */
+    class DIGITAL_API diff_encoder_bb : virtual public sync_block
+    {
+    public:
+      // gr::digital::diff_encoder_bb::sptr
+      typedef boost::shared_ptr<diff_encoder_bb> sptr;
+
+      /*!
+       * Make a differntial encoder block.
+       *
+       * \param modulus Modulus of code's alphabet
+       */
+      static sptr make(unsigned int modulus);
+    };
+
+  } /* namespace digital */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_DIFF_ENCODER_BB_H */