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diff --git a/fuzzylite/fl/term/SigmoidProduct.h b/fuzzylite/fl/term/SigmoidProduct.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_SIGMOIDPRODUCT_H
+#define FL_SIGMOIDPRODUCT_H
+
+#include "fl/term/Term.h"
+
+namespace fl {
+
+    class FL_API SigmoidProduct : public Term {
+    protected:
+        scalar _left;
+        scalar _rising;
+        scalar _falling;
+        scalar _right;
+
+    public:
+        explicit SigmoidProduct(const std::string& name = "",
+                scalar left = fl::nan,
+                scalar rising = fl::nan,
+                scalar falling = fl::nan,
+                scalar right = fl::nan,
+                scalar height = 1.0);
+        virtual ~SigmoidProduct() FL_IOVERRIDE;
+        FL_DEFAULT_COPY_AND_MOVE(SigmoidProduct)
+
+        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 setLeft(scalar leftInflection);
+        virtual scalar getLeft() const;
+
+        virtual void setRising(scalar risingSlope);
+        virtual scalar getRising() const;
+
+        virtual void setFalling(scalar fallingSlope);
+        virtual scalar getFalling() const;
+
+        virtual void setRight(scalar rightInflection);
+        virtual scalar getRight() const;
+
+        virtual SigmoidProduct* clone() const FL_IOVERRIDE;
+
+        static Term* constructor();
+    };
+}
+#endif  /* FL_SIGMOIDPRODUCT_H */
+