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diff --git a/concept/Persistent_cohomology/PersistentHomology.h b/concept/Persistent_cohomology/PersistentHomology.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):       Clément Maria
+  *
+  *    Copyright (C) 2014  INRIA Sophia Antipolis-Méditerranée (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 Concept describing the requirements for a class to compute 
+  * persistent homology. */
+struct PersistentHomology {
+
+/** \brief Type of filtered cell complex on which persistent homology
+  * is computed.
+  *
+  * Must be a model of concept FilteredComplex.
+  */
+  typedef unspecified Filtered_complex;
+
+/** \brief Type of coefficients to be used for computing persistent 
+  * homology.
+  *
+  * Must be a model of concept CoefficientField.
+  */
+  typedef unspecified Coefficient_field;
+
+ };