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diff --git a/gr-howto-write-a-block/lib/square2_ff_impl.h b/gr-howto-write-a-block/lib/square2_ff_impl.h
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+++ b/gr-howto-write-a-block/lib/square2_ff_impl.h
@@ -0,0 +1,51 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2012 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_HOWTO_SQUARE2_FF_IMPL_H
+#define INCLUDED_HOWTO_SQUARE2_FF_IMPL_H
+
+#include <howto/square2_ff.h>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace howto {
+    
+    class square2_ff_impl : public square2_ff
+    {
+    private: 
+      // Nothing to declare in this block.
+
+    public:
+      square2_ff_impl();	// implementation constructor
+      ~square2_ff_impl();	// implementation destructor
+
+      // Where all the action really happens
+
+      int work(int noutput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+    };
+
+  } // namespace howto
+} // namespace gr
+
+#endif /* INCLUDED_HOWTO_SQUARE2_FF_IMPL_H */