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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 Jamin
+*
+*    Copyright (C) 2017  INRIA
+*
+*    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/>.
+*/
+
+#ifndef DOC_COMMON_FILE_FORMAT_H_
+#define DOC_COMMON_FILE_FORMAT_H_
+
+namespace Gudhi {
+
+/*! \page fileformats File formats
+
+ \tableofcontents
+
+ \section FileFormatsPers Persistence Diagram
+
+ Such a file, whose extension is usually `.pers`, contains a list of persistence intervals.<br>
+ Lines starting with `#` are ignored (comments).<br>
+ Other lines might contain 2, 3 or 4 values (the number of values on each line must be the same for all lines):
+ \verbatim
+   [[field] dimension] birth death
+ \endverbatim
+
+ Here is a simple sample file:
+ \verbatim
+   # Persistence diagram example
+   2 2.7 3.7
+   2 9.6 14.
+   # Some comments
+   3 34.2 34.974
+   4 3. inf
+ \endverbatim
+
+ Other sample files can be found in the `data/persistence_diagram` folder.
+
+ Such files can be generated with `Gudhi::persistent_cohomology::Persistent_cohomology::output_diagram()` and read with
+ `Gudhi::read_persistence_intervals_and_dimension()`, `Gudhi::read_persistence_intervals_grouped_by_dimension()` or
+ `Gudhi::read_persistence_intervals_in_dimension()`.
+*/
+}  // namespace Gudhi
+
+#endif  // DOC_COMMON_FILE_FORMAT_H_