=head2 Changes to Existing Documentation
+=head3 L<perlfunc>
+
+=over 4
+
+=item *
+
+The documentation of C<ref> has been updated to recommend the use of
+C<blessed>, C<isa> and C<reftype> when dealing with references to blessed
+objects.
+
+=back
+
+=head3 L<perlguts>
+
+=over 4
+
+=item *
+
+The explanation of the use of the C<SVs_PADMY> and C<SVs_PADTMP> flags in
+determining whether an SV lives on a scratchpad has been clarified.
+
+=back
+
=head3 L<perlopentut>
=over 4
=back
+=head3 L<perlvar>
+
+=over 4
+
+=item *
+
+A new section explaining the performance issues of $`, $& and $', including
+workarounds and changes in different versions of Perl, has been added.
+
+=back
+
=head3 L<perlxs>
=over 4