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diff --git a/src/Gudhi_stat/concept/Topological_data_with_scalar_product.h b/src/Gudhi_stat/concept/Topological_data_with_scalar_product.h
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+/*    This file is part of the Gudhi Library. The Gudhi library
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++
+ *    library for computational topology.
+ *
+ *    Author(s):       Pawel Dlotko
+ *
+ *    Copyright (C) 2015  INRIA (France)
+ *
+ *    This program 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 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+/** \brief The concept Topological_data_with_scalar_product describes the requirements 
+  * for a type to implement a container that allows computations of scalar products. 
+  */
+class Topological_data_with_scalar_product
+{
+public:  
+    double compute_scalar_product( const Topological_data_with_scalar_product& second );    
+};