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diff --git a/src/Persistence_representations/concept/Topological_data_with_scalar_product.h b/src/Persistence_representations/concept/Topological_data_with_scalar_product.h
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+/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
+ *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
+ *    Author(s):       Pawel Dlotko
+ *
+ *    Copyright (C) 2016 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+#ifndef CONCEPT_TOPOLOGICAL_DATA_WITH_SCALAR_PRODUCT_H_
+#define CONCEPT_TOPOLOGICAL_DATA_WITH_SCALAR_PRODUCT_H_
+
+namespace Gudhi {
+
+namespace Persistence_representations {
+
+/** \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);
+};
+
+}  // namespace Persistence_representations
+
+}  // namespace Gudhi
+
+#endif  // CONCEPT_TOPOLOGICAL_DATA_WITH_SCALAR_PRODUCT_H_