* (T141604) Extensions can now provide a better error message when their
maintenance scripts are run without the extension being installed.
* (T8948) Numeric sorting in categories is now supported by setting $wgCategoryCollation
- to uca-default-u-kn or uca-<langcode>-u-kn. If migrating from another
+ to 'uca-default-u-kn' or 'uca-<langcode>-u-kn'. If you can't use UCA collations,
+ a 'numeric' collation is also available. If migrating from another
collation, you will need to run the updateCollation.php maintenance script.
=== External library changes in 1.28 ===