+You should also test any extensions, and upgrade these if necessary.
+
+== Upgrading from 1.8 wikis ==
+
+MediaWiki 1.9 and later no longer keep default localized message text
+in the database; 'MediaWiki:'-namespace pages that do not exist in the
+database are simply transparently filled-in on demand.
+
+The upgrade process will delete any 'MediaWiki:' pages which are left
+in the default state (last edited by 'MediaWiki default'). This may
+take a few moments, similar to the old initial setup.
+
+Note that the large number of deletions may cause older edits to expire
+from the list on Special:Recentchanges, although the deletions themselves
+will be hidden by default. (Click "show bot edits" to list them.)
+
+
+See RELEASE-NOTES for more details about new and changed options.
+
+
+== Upgrading from 1.7 wikis ==
+
+$wgDefaultUserOptions now contains all the defaults, not only overrides.
+If you're setting this as a complete array(), you may need to change it
+to set only specific items as recommended in DefaultSettings.php.
+
+== Upgrading from 1.6 wikis ==
+
+$wgLocalTZoffset was in hours, it is now using minutes.
+Link autonumbering got fixed (#5918) for protocols other than http.
+ - 'irc://irc.server.tld/' render as a link with a chat icon
+ - '[irc://irc.server.tld]' render as an autonumbered link: [1]
+