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diff --git a/decoder/csplit.h b/decoder/csplit.h
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+++ b/decoder/csplit.h
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+#ifndef _CSPLIT_H_
+#define _CSPLIT_H_
+
+#include "translator.h"
+#include "lattice.h"
+
+// this "translator" takes single words (with NO SPACES) and segments
+// them using the approach described in:
+//
+// C. Dyer. (2009) Using a maximum entropy model to build segmentation
+//                 lattices for MT. In Proceedings of NAACL HLT 2009.
+// note, an extra word space marker # is inserted at the left edge of
+// the forest!
+struct CompoundSplitImpl;
+struct CompoundSplit : public Translator {
+  CompoundSplit(const boost::program_options::variables_map& conf);
+  bool Translate(const std::string& input,
+                 SentenceMetadata* smeta,
+                 const std::vector<double>& weights,
+                 Hypergraph* forest);
+
+  // given a forest generated by CompoundSplit::Translate,
+  // find the edge representing the unsegmented form
+  static int GetFullWordEdgeIndex(const Hypergraph& forest);
+
+ private:
+  boost::shared_ptr<CompoundSplitImpl> pimpl_;
+};
+
+#endif