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diff --git a/helm/ocaml/cic/discrimination_tree.mli b/helm/ocaml/cic/discrimination_tree.mli
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+(* Copyright (C) 2005, HELM Team.
+ * 
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ * 
+ * HELM 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 2
+ * of the License, or (at your option) any later version.
+ * 
+ * HELM 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 HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ * 
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+module DiscriminationTreeIndexing :
+  functor (A : Set.S) ->
+    sig
+
+      val arities : (Cic.term, int) Hashtbl.t 
+
+      type key = Cic.term
+      type t 
+
+      val empty : t
+      val index : t -> key -> A.elt -> t
+      val remove_index : t -> key -> A.elt -> t
+      val in_index : t -> key -> (A.elt -> bool) -> bool
+      val retrieve_generalizations : t -> key -> A.t
+      val retrieve_unifiables : t -> key -> A.t
+    end
+
+