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diff --git a/include/gudhi/Simplex_tree/indexing_tag.h b/include/gudhi/Simplex_tree/indexing_tag.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/>.
+ */
+
+#ifndef SIMPLEX_TREE_INDEXING_TAG_H_
+#define SIMPLEX_TREE_INDEXING_TAG_H_
+
+namespace Gudhi {
+
+/** \brief Tag for a linear ordering of simplices. 
+ *
+ * \implements IndexingTag
+ */
+struct linear_indexing_tag {
+};
+
+/* \brief Tag for a zigzag ordering of simplices. */
+//  struct zigzag_indexing_tag {};
+}  // namespace Gudhi
+
+#endif  // SIMPLEX_TREE_INDEXING_TAG_H_