* `title_natural` - Only available if [[!cpan Sort::Naturally]] is
installed. Orders by title, but numbers in the title are treated
as such, ("1 2 9 10 20" instead of "1 10 2 20 9")
+[[!if test="enabled(meta)" then="""
+* `meta_title` - Order by the full title set by the `\[[!meta title="foo"]]`
+ [[ikiwiki/directive]].
+"""]]
+
+Plugins can add additional sort orders, so more might be available on this
+wiki.
+
+[[!meta robots="noindex, follow"]]