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diff --git a/gr-trellis/include/trellis/permutation.h b/gr-trellis/include/trellis/permutation.h
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+++ b/gr-trellis/include/trellis/permutation.h
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+/* -*- 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_TRELLIS_PERMUTATION_H
+#define INCLUDED_TRELLIS_PERMUTATION_H
+
+#include <trellis/api.h>
+#include <vector>
+#include <gr_sync_block.h>
+
+namespace gr {
+  namespace trellis {
+
+    /*!
+     * \brief Permutation.
+     * \ingroup coding_blk
+     */
+    class TRELLIS_API permutation : virtual public gr_sync_block
+    {
+    public:
+      // gr::trellis::permutation::sptr
+      typedef boost::shared_ptr<permutation> sptr;
+
+      static sptr make(int K, const std::vector<int> &TABLE,
+		       int SYMS_PER_BLOCK, size_t NBYTES);
+
+      virtual int K() const = 0;
+      virtual const std::vector<int> & TABLE() const = 0;
+      virtual int SYMS_PER_BLOCK() const = 0;
+      virtual size_t BYTES_PER_SYMBOL() const = 0;
+    };
+
+  } /* namespace trellis */
+} /* namespace gr */
+
+#endif /* INCLUDED_TRELLIS_PERMUTATION_H */