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diff --git a/fuzzylite/fl/term/Concave.h b/fuzzylite/fl/term/Concave.h
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+/*
+ Author: Juan Rada-Vilela, Ph.D.
+ Copyright (C) 2010-2014 FuzzyLite Limited
+ All rights reserved
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or (at your option)
+ any later version.
+
+ fuzzylite 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 Lesser General Public License
+ for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with fuzzylite.  If not, see <http://www.gnu.org/licenses/>.
+
+ fuzzylite™ is a trademark of FuzzyLite Limited.
+
+ */
+
+#ifndef FL_CONCAVE_H
+#define FL_CONCAVE_H
+
+#include "fl/term/Term.h"
+
+
+namespace fl {
+
+    class FL_API Concave : public Term {
+    protected:
+        scalar _inflection, _end;
+    public:
+        explicit Concave(const std::string& name = "",
+                scalar inflection = fl::nan,
+                scalar end = fl::nan,
+                scalar height = 1.0);
+        virtual ~Concave() FL_IOVERRIDE;
+        FL_DEFAULT_COPY_AND_MOVE(Concave)
+
+        virtual std::string className() const FL_IOVERRIDE;
+        virtual std::string parameters() const FL_IOVERRIDE;
+        virtual void configure(const std::string& parameters) FL_IOVERRIDE;
+
+        virtual scalar membership(scalar x) const FL_IOVERRIDE;
+
+        virtual void setInflection(scalar inflection);
+        virtual scalar getInflection() const;
+
+        virtual void setEnd(scalar end);
+        virtual scalar getEnd() const;
+
+        virtual Concave* clone() const FL_IOVERRIDE;
+
+        static Term* constructor();
+    };
+}
+
+
+#endif  /* FL_CONCAVE_H */
+