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diff --git a/lib/Catalyst/Upgrading.pod b/lib/Catalyst/Upgrading.pod
index dc54861..07a1a67 100644
--- a/lib/Catalyst/Upgrading.pod
+++ b/lib/Catalyst/Upgrading.pod
@@ -14,8 +14,10 @@ be taken with this upgrade and that testing should be greater than would be
 the case with a minor point update.
 
 It is highly recommended that you become familar with the L<Plack> ecosystem
-and documentation.  Being able to take advantage of L<Plack> development and
-middleware is a major bonus to this upgrade.
+and documentation. Being able to take advantage of L<Plack> development and
+middleware is a major bonus to this upgrade. Documentation about how to
+take advantage of L<Plack::Middleware> by writing your own C<< .psgi >> file
+is contained in L<Catalyst::PSGI>.
 
 If you have created a custom subclass of L<Catalyst:Engine> you will need to
 convert it to be a subclass of L<Plack::Handler>.
@@ -43,7 +45,7 @@ work using using L<Plack::Handler::Apache1> or L<Plack::Handler::Apache2>
 as required.  
 
 L<Catalyst::Engine::Apache2::MP19>, is however no longer supported, as Plack
-does not support mod_perl version 1.99??? FIXME - is this true?
+does not support mod_perl version 1.99
 
 =head2 Upgrading the HTTP Engine
 
@@ -61,19 +63,30 @@ myapp_cgi.pl script is already upgraded enough to use L<Catalyst::Script::CGI>.
 If you were using L<Catalyst::Engine::HTTP::Prefork> then L<Starman>
 is automatically loaded.
 
-XXX FIXME - note how to run Starman with different options.
+If you were customising your server script to pass opttions to the prefork engine,
+then this is no longer supported. The recommended route to implement this functionality
+is to write a simple .psgi file for your application, then use the L<plackup> untility.
 
 =head2 Upgrading the PSGI Engine
 
 If you were using L<Catalyst::Engine::PSGI> this new release supercedes this
 engine in supporting L<Plack>. By default the Engine is now always L<Plack>.
 As a result, you can stop depending on L<Catalyst::Engine::PSGI> in your
-C<Makefile.PL>.  Additionally, if you have an C<app.psgi> script you no longer
+C<Makefile.PL>. 
+
+Applications that were using L<Catalyst::Engine::PSGI>
+previously should entirely continue to work in this release with no changes.
+
+However, if you have an C<app.psgi> script, then you no longer
 need to specify the PSGI engine.  Instead, the L<Catalyst> application class
-now has a new method C<psgi_app> which returns a L<Plack> compatible coderef.
+now has a new method C<psgi_app> which returns a L<PSGI> compatible coderef
+which you can wrap in middleware of your choice.
+
+Catalyst will use the .psgi for your application if it is located in the C<home>
+directory of the application
 
 For example, if you were using L<Catalyst::Engine::PSGI> in the past, you will
-have written (or generated) an C<app.psgi> file similar to this one:
+have written (or generated) a C<script/myapp.psgi> file similar to this one:
 
     use Plack::Builder;
     use MyCatalytApp;
@@ -85,7 +98,7 @@ have written (or generated) an C<app.psgi> file similar to this one:
         sub { MyCatalystApp->run(@_) };
     };
 
-Instead, you should now just do:
+Instead, you now say:
 
     use Plack::Builder;
     use MyCatalystApp;
@@ -95,11 +108,27 @@ Instead, you should now just do:
         MyCatalystApp->psgi_app;
     };
 
-Applications that were using and deploying via L<Catalyst::Engine::PSGI>
-previously should entirely continue to work in this release with no changes,
-however if you were using Catalyst::Engine::PSGI previously, then this is
-not compatible with L<Catalyst::Test> in the new version, and instead of
-running a test server
+In the simplest case:
+
+    MyCatalystApp->setup_engine('PSGI');
+    my $app = sub { MyCatalystApp->run(@_) }
+
+becomes
+
+    MyCatalystApp->setup_engine('PSGI');
+    my $app = MyCatalystApp->psgi_app(@_);
+
+B<NOT>:
+
+    my $app = sub { MyCatalystApp->psgi_app(@_) };
+    # If you make ^^ this mistake, your app won't work, and will confuse the hell out of you!
+
+You can now rename C<< script/myapp.psgi >> to C<< myapp.psgi >>, and the built-in
+Catalyst scripts, and your test suite will start using your .psgi file.
+
+B<NOTE:> If you rename your .psgi file without these modifications, then any tests run via
+L<Catalyst::Test> will not be compatible with the new release, and will result in
+the development server starting, rather than the expected test running.
 
 =head2 Engines which are known broken
 
@@ -113,6 +142,14 @@ to the engine code.
 
 =item Catalyst::Engine::Wx
 
+=item Catalyst::Engine::Zeus
+
+=item Catalyst::Engine::JobQueue::POE
+
+=item Catalyst::Engine::XMPP2
+
+=item Catalyst::Engine::SCGI
+
 =back
 
 =head2 Engines with unknown status
@@ -120,23 +157,34 @@ to the engine code.
 The following engines have untested or unknown compatibility.  Reports are
 highly welcomed:
 
-    Catalyst::Engine::Embeddable - needs testing, should work?
-    Catalyst::Engine::XMPP2
-    Catalyst::Engine::SCGI
-    Catalyst::Engine::Mojo
-    Catalyst::Engine::Zeus - broken for ages
-    Catalyst::Engine::JobQueue::POE - broken for ages
-    Catalyst::Engine::Stomp - fixed
-    Catalyst::Engine::Server (Marked as Deprecated)
-    Catalyst::Engine::HTTP::POE (Marked as Deprecated)
+=over
+
+=item Catalyst::Engine::Mojo
+
+=item Catalyst::Engine::Server (Marked as Deprecated)
+
+=item Catalyst::Engine::HTTP::POE (Marked as Deprecated)
+
+=back
+
+=head2 Specifying the engine in the call to ->setup
+
+XXX FIXME
+
+=head2 Plack functionality
+
+See L<Catalyst::PSGI>.
 
-=head2 Using middleware
+=head2 Tests in 5.89
 
-XXX Should this be here or elsewhere?
+Tests should generally work the same in Catalyst 5.89, however there are some differences.
 
-=head2 Making an app.psgi file
+Previously, if using L<Catalyst::Test> and doing local requests (against a local server),
+if the application threw an exception then this exception propagated into the test.
 
-=head2 Running with plackup?
+This behaviour has been removed, and now a 500 response will be returned to the test.
+This change unifies behaviour, to make local test requests behave similarly to remote 
+requests.
 
 =head1 Upgrading to Catalyst 5.80
 
@@ -221,7 +269,7 @@ you identify the ones in conflict, and resolve them.
 To be able to generate a linear @ISA, the list of superclasses for each
 class must be resolvable using the C3 algorithm. Unfortunately, when
 superclasses are being used as mixins (to add functionality used in your class),
-and with multiple inheritence, it is easy to get this wrong.
+and with multiple inheritance, it is easy to get this wrong.
 
 Most common is the case of: