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diff --git a/gr-digital/include/digital_glfsr_source_b.h b/gr-digital/include/digital_glfsr_source_b.h
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+++ b/gr-digital/include/digital_glfsr_source_b.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2012 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_GLFSR_SOURCE_B_H
+#define INCLUDED_GR_GLFSR_SOURCE_B_H
+
+#include <digital_api.h>
+#include <gr_sync_block.h>
+
+class gri_glfsr;
+
+class digital_glfsr_source_b;
+typedef boost::shared_ptr<digital_glfsr_source_b> digital_glfsr_source_b_sptr;
+
+DIGITAL_API digital_glfsr_source_b_sptr
+digital_make_glfsr_source_b(int degree, bool repeat=true,
+			    int mask=0, int seed=1);
+
+/*!
+ * \brief Galois LFSR pseudo-random source
+ * \ingroup source_blk
+ *
+ * \param degree Degree of shift register must be in [1, 32]. If mask
+ *               is 0, the degree determines a default mask (see
+ *               digital_impl_glfsr.cc for the mapping).
+ * \param repeat Set to repeat sequence.
+ * \param mask   Allows a user-defined bit mask for indexes of the shift
+ *               register to feed back.
+ * \param seed   Initial setting for values in shift register.
+ */
+class DIGITAL_API digital_glfsr_source_b : public gr_sync_block
+{
+ private:
+  friend DIGITAL_API digital_glfsr_source_b_sptr
+    digital_make_glfsr_source_b(int degree, bool repeat,
+				int mask, int seed);
+
+  gri_glfsr *d_glfsr;
+
+  bool d_repeat;
+  unsigned int d_index;
+  unsigned int d_length;
+
+  digital_glfsr_source_b(int degree, bool repeat,
+			 int mask, int seed);
+
+ public:
+
+  ~digital_glfsr_source_b();
+
+  int work(int noutput_items,
+	   gr_vector_const_void_star &input_items,
+	   gr_vector_void_star &output_items);
+
+  unsigned int period() const { return d_length; }
+  int mask() const;
+};
+
+#endif /* INCLUDED_GR_GLFSR_SOURCE_B_H */