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diff --git a/kernel/sorts.mli b/kernel/sorts.mli
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(** {6 The sorts of CCI. } *)
+
+type contents = Pos | Null
+
+type family = InProp | InSet | InType
+
+type t =
+| Prop of contents       (** Prop and Set *)
+| Type of Univ.universe  (** Type *)
+
+val set  : t
+val prop : t
+val type1  : t
+
+val equal : t -> t -> bool
+val compare : t -> t -> int
+val hash : t -> int
+
+val is_set : t -> bool
+val is_prop : t -> bool
+val is_small : t -> bool
+val family : t -> family
+
+val hcons : t -> t
+
+val family_equal : family -> family -> bool
+
+module List : sig
+  val mem : family -> family list -> bool
+  val intersect : family list -> family list -> family list
+end
+
+val univ_of_sort : t -> Univ.universe
+val sort_of_univ : Univ.universe -> t