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diff --git a/clib/hMap.mli b/clib/hMap.mli
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2017     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+module type HashedType =
+sig
+  type t
+  val compare : t -> t -> int
+  (** Total ordering *)
+  val hash : t -> int
+  (** Hashing function compatible with [compare], i.e. [compare x y = 0] implies
+      [hash x = hash y]. *)
+end
+
+(** Hash maps are maps that take advantage of having a hash on keys. This is
+    essentially a hash table, except that it uses purely functional maps instead
+    of arrays.
+
+    CAVEAT: order-related functions like [fold] or [iter] do not respect the
+    provided order anymore! It's your duty to do something sensible to prevent
+    this if you need it. In particular, [min_binding] and [max_binding] are now
+    made meaningless.
+*)
+module Make(M : HashedType) : CMap.ExtS with type key = M.t