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diff --git a/gr-blocks/include/blocks/peak_detector2_fb.h b/gr-blocks/include/blocks/peak_detector2_fb.h
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+++ b/gr-blocks/include/blocks/peak_detector2_fb.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2013 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_PEAK_DETECTOR2_FB_H
+#define INCLUDED_GR_PEAK_DETECTOR2_FB_H
+
+#include <blocks/api.h>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace blocks {
+
+    /*!
+     * \brief Detect the peak of a signal
+     * \ingroup level_blk
+     *
+     * If a peak is detected, this block outputs a 1, or it outputs
+     * 0's. A separate debug output may be connected, to view the
+     * internal EWMA described below.
+     *
+     * \param threshold_factor_rise The threshold factor determins
+     *        when a peak is present. An EWMA average of the signal is
+     *        calculated and when the value of the signal goes over
+     *        threshold_factor_rise*average, we call the peak.
+     * \param look_ahead The look-ahead value is used when the
+     *        threshold is found to locate the peak within this range.
+     * \param alpha The gain value of a single-pole moving average filter.
+     */
+    class BLOCKS_API peak_detector2_fb : virtual public gr_sync_block
+    {
+    public:
+      // gr::blocks::peak_detector2_fb::sptr
+      typedef boost::shared_ptr<peak_detector2_fb> sptr;
+
+      static sptr make(float threshold_factor_rise=7,
+                       int look_ahead=1000, float alpha=0.001);
+
+      /*! \brief Set the threshold factor value for the rise time
+       *  \param thr new threshold factor
+       */
+      virtual void set_threshold_factor_rise(float thr) = 0;
+
+      /*! \brief Set the look-ahead factor
+       *  \param look new look-ahead factor
+       */
+      virtual void set_look_ahead(int look) = 0;
+
+      /*! \brief Set the running average alpha
+       *  \param alpha new alpha for running average
+       */
+      virtual void set_alpha(int alpha) = 0;
+
+      /*! \brief Get the threshold factor value for the rise time
+       *  \return threshold factor
+       */
+      virtual float threshold_factor_rise() = 0;
+
+      /*! \brief Get the look-ahead factor value
+       *  \return look-ahead factor
+       */
+      virtual int look_ahead() = 0;
+
+      /*! \brief Get the alpha value of the running average
+       *  \return alpha
+       */
+      virtual float alpha() = 0;
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_PEAK_DETECTOR2_FB_H */