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diff --git a/components/ng_kernel/nCicUtils.mli b/components/ng_kernel/nCicUtils.mli
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+++ b/components/ng_kernel/nCicUtils.mli
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+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.      
+     \ /   This software is distributed as is, NO WARRANTY.     
+      V_______________________________________________________________ *)
+
+(* $Id: nCicSubstitution.ml 8135 2008-02-13 15:35:43Z tassi $ *)
+
+exception Subst_not_found of int
+exception Meta_not_found of int
+
+val sharing_map: ('a -> 'a) -> 'a list -> 'a list
+
+val expand_local_context : NCic.lc_kind -> NCic.term list
+
+val lookup_subst: int ->  NCic.substitution -> NCic.subst_entry
+val lookup_meta: int ->  NCic.metasenv -> NCic.conjecture
+
+(* both functions raise "assert false" when a Meta is found
+ * call the 'a->'a function when a binder is crossed *)
+val fold:
+  (NCic.hypothesis -> 'k -> 'k) -> 'k ->
+  ('k -> 'a -> NCic.term -> 'a) -> 'a -> NCic.term -> 'a
+val map:
+ (NCic.hypothesis -> 'k -> 'k) -> 'k ->
+ ('k -> NCic.term -> NCic.term) -> NCic.term -> NCic.term
+
+val is_closed: NCic.term -> bool