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diff --git a/decoder/ff_const_reorder.h b/decoder/ff_const_reorder.h
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+/*
+ * ff_const_reorder.h
+ *
+ *  Created on: Jul 11, 2013
+ *      Author: junhuili
+ */
+
+#ifndef FF_CONST_REORDER_H_
+#define FF_CONST_REORDER_H_
+
+#include "ff_factory.h"
+#include "ff.h"
+
+struct ConstReorderFeatureImpl;
+
+// Soft reordering constraint features from
+// http://www.aclweb.org/anthology/P14-1106. To train the classifers,
+// use utils/const_reorder_model_trainer for constituency reordering
+// constraints and utils/argument_reorder_model_trainer for SRL
+// reordering constraints.
+//
+// Input segments should provide path to parse tree (resp. SRL parse)
+// as "parse" (resp. "srl") properties.
+class ConstReorderFeature : public FeatureFunction {
+ public:
+  ConstReorderFeature(const std::string& param);
+  ~ConstReorderFeature();
+  static std::string usage(bool param, bool verbose);
+
+ protected:
+  virtual void PrepareForInput(const SentenceMetadata& smeta);
+
+  virtual void TraversalFeaturesImpl(
+      const SentenceMetadata& smeta, const HG::Edge& edge,
+      const std::vector<const void*>& ant_contexts,
+      SparseVector<double>* features, SparseVector<double>* estimated_features,
+      void* out_context) const;
+
+ private:
+  ConstReorderFeatureImpl* pimpl_;
+};
+
+#endif /* FF_CONST_REORDER_H_ */