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diff --git a/src/Persistent_cohomology/concept/CoefficientField.h b/src/Persistent_cohomology/concept/CoefficientField.h
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+++ b/src/Persistent_cohomology/concept/CoefficientField.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):       Clément Maria
+ *
+ *    Copyright (C) 2014 Inria
+ *
+ *    Modification(s):
+ *      - YYYY/MM Author: Description of the modification
+ */
+
+/** \brief Concept describing the requirements for a class to represent 
+  * a field of coefficients to compute persistent homology.
+  */
+struct CoefficientField {
+
+/** \brief Type of element of the field.
+  *
+  * Must be Assignable. */
+  typedef unspecified Element;
+
+/** Default constructible. */
+  CoefficientField();
+  
+  void init(Element charac);
+  void init(Element charac_min, Element charac_max);
+
+/** Return the characteristic of the field. */
+  Element characteristic();
+/** Return the element 1 of the field. */
+  Element multiplicative_identity();
+/** Return the element 0 of the field. */
+  Element additive_identity();
+
+/** Assign: x <- x + y */
+  void plus_equal(Element x, Element y);
+
+/** */
+//... inverse()
+
+  };
+\ No newline at end of file