The base DBI Loader contains generic methods that *should* work for
everything else in theory, although in practice some DBDs need to
override one or more of the other methods. The other methods one might
-likely want to override are: C<_table_pk_info>, C<_table_fk_info>, and
-C<_tables_list>. See the included DBD drivers for examples of these.
+likely want to override are: C<_table_pk_info>, C<_table_fk_info>,
+C<_tables_list> and C<_extra_column_info>. See the included DBD drivers
+for examples of these.
=cut