Catalyst::Upgrading - Instructions for upgrading to the latest Catalyst
+=head1 Upgrading to Catalyst 5.90040
+
+This version of L<Catalyst> offers some support for using L<AnyEvent> and
+L<IO::Async> event loops in your application. These changes should work
+fine for most applications however if you are already trying to perform
+some streaming, minor changes in this area of the code might affect your
+functionality.
+
+ TDB: more on streaming, transfer encoding chunked, etc.
+
=head1 Upgrading to Catalyst 5.9
The major change is that L<Plack>, a toolkit for using the L<PSGI>