+
+## Documentation from sort-package branch
+
+The changes to [[ikiwiki/pagespec/sorting]] are the same.
+The changes to [[plugins/write]] are replaced by:
+
+### Sorting plugins
+
+Similarly, it's possible to write plugins that add new functions as
+[[ikiwiki/pagespec/sorting]] methods. To achieve this, add a function to
+the IkiWiki::PageSpec package named `cmp_foo`, which will be used when sorting
+by `foo` or `foo(...)` is requested.
+
+The function will be passed three or more parameters. The first two are
+page names, and the third is `undef` if invoked as `foo`, or the parameter
+`"bar"` if invoked as `foo(bar)`. It may also be passed additional, named
+parameters.
+
+It should return the same thing as Perl's `cmp` and `<=>` operators: negative
+if the first argument is less than the second, positive if the first argument
+is greater, or zero if they are considered equal. It may also raise an
+error using `error`, for instance if it needs a parameter but one isn't
+provided.
+
+You can also define a function called `check_cmp_foo` in the same package.
+If you do, it will be called while preparing to sort by `foo` or `foo(bar)`,
+with argument `undef` or `"bar"` respectively; it may raise an error using
+`error`, if sorting like that isn't going to work.