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diff --git a/gr-analog/include/analog/pll_freqdet_cf.h b/gr-analog/include/analog/pll_freqdet_cf.h
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+++ b/gr-analog/include/analog/pll_freqdet_cf.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2011 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_ANALOG_PLL_FREQDET_CF_H
+#define INCLUDED_ANALOG_PLL_FREQDET_CF_H
+
+#include <analog/api.h>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace analog {
+    
+    /*!
+     * \brief Implements a PLL which locks to the input frequency and outputs
+     * an estimate of that frequency.  Useful for FM Demod.
+     * \ingroup sync_blk
+     *
+     * Input stream 0: complex
+     * Output stream 0: float
+     *
+     * This PLL locks onto a [possibly noisy] reference carrier on
+     * the input and outputs an estimate of that frequency in radians per sample.
+     * All settings max_freq and min_freq are in terms of radians per sample,
+     * NOT HERTZ.  The loop bandwidth determins the lock range and should be set
+     * around pi/200 -- 2pi/100.
+     * \sa pll_refout_cc, pll_carriertracking_cc
+     */
+    class ANALOG_API pll_freqdet_cf : virtual public gr_sync_block
+    {
+    public:
+      // gr::analog::pll_freqdet_cf::sptr
+      typedef boost::shared_ptr<pll_freqdet_cf> sptr;
+      
+      /* \brief Make PLL block that outputs the tracked signal's frequency.
+       *
+       * \param loop_bw: control loop's bandwidth parameter.
+       * \param max_freq: maximum (normalized) frequency PLL will lock to.
+       * \param min_freq: minimum (normalized) frequency PLL will lock to.
+       */
+      static sptr make(float loop_bw, float max_freq, float min_freq);
+
+      virtual void set_loop_bandwidth(float bw) = 0;
+      virtual void set_damping_factor(float df) = 0;
+      virtual void set_alpha(float alpha) = 0;
+      virtual void set_beta(float beta) = 0;
+      virtual void set_frequency(float freq) = 0;
+      virtual void set_phase(float phase) = 0;
+      virtual void set_min_freq(float freq) = 0;
+      virtual void set_max_freq(float freq) = 0;
+
+      virtual float get_loop_bandwidth() const = 0;
+      virtual float get_damping_factor() const = 0;
+      virtual float get_alpha() const = 0;
+      virtual float get_beta() const = 0;
+      virtual float get_frequency() const = 0;
+      virtual float get_phase() const = 0;
+      virtual float get_min_freq() const = 0;
+      virtual float get_max_freq() const = 0;
+    };
+
+  } /* namespace analog */
+} /* namespace gr */
+
+#endif /* INCLUDED_ANALOG_PLL_FREQDET_CF_H */