=head1 NAME
-Moose::Meta::TypeConstraint::Registry
+Moose::Meta::TypeConstraint::Registry - registry for type constraints
=head1 DESCRIPTION
+This module is currently only use internally by L<Moose::Util::TypeConstraints>.
+It can be used to create your own private type constraint registry as well, but
+the details of that are currently left as an exercise to the reader. (One hint:
+You can use the 'parent_registry' feature to connect your private version with the
+base Moose registry and base Moose types will automagically be found too).
+
=head1 METHODS
=over 4