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diff --git a/helm/software/matita/matita.txt b/helm/software/matita/matita.txt
index ce34e404c..9873b14b2 100644
--- a/helm/software/matita/matita.txt
+++ b/helm/software/matita/matita.txt
@@ -1,3 +1,35 @@
+###
+ Regole di eliminazione per tipi induttivi:
+ > - as you point it out, unit implies small, hence the clause "if
+ > Environ.engagement ..." is useles; revision 1.46 apparently missed
+ > this point;
+ and I was wrong. Components of constructors that are arities in Prop
+ (i.e. of the form ... -> Prop) are considered as unit (at least in
+ Coq). Hence you can have non small unit types. The typical example is
+
+ Inductive T : Prop := C : Prop -> T.
+
+ As a consequence, my modification of the code of Indtypes.allowed_sorts
+ introduced a consistency hole (with elimination from T to Type, Prop
+ becomes equivalent to T and system Type:Type becomes a subsystem of
+ Coq). If you have a similar allowance in Matita, it may be problematic
+ too.
+
+
+
+** introdurre una tattica primitiva "enlarge_metasenv" che cambia il metasenv
+ aggiungendo nuove meta e tenendo traccia dei nuovi goal aperti; usarla
+ ovunque rimuovendo ProofEngineHelpers.compare_metasenv. Questo dovrebbe
+ anche permettere a lungo termine di rendere lo stato un tipo opaco.
+
+
+Possibile causa di rallentamenti:
+1. The last commit that fixed unification of compound coercions with
+ applied atomic coercions used to introduce too many compound coercions
+ at the end. In this commit we fix the problem in a brutal way by
+ mergin coercions every time CicMetaSubst.apply_subst is called.
+ To be refined later on.
+
Ferruccio ha cambiato matita.lang:
> iforall
> iexists