'dir' => 'In which direction to sort',
'start' => "Timestamp to start listing from. Can only be used with {$p}sort=timestamp",
'end' => "Timestamp to end listing at. Can only be used with {$p}sort=timestamp",
- 'startsortkey' => "Sortkey to start listing from. Can only be used with {$p}sort=sortkey",
- 'endsortkey' => "Sortkey to end listing at. Can only be used with {$p}sort=sortkey",
+ 'startsortkey' => "Sortkey to start listing from. Must be given in binary format. Can only be used with {$p}sort=sortkey",
+ 'endsortkey' => "Sortkey to end listing at. Must be given in binary format. Can only be used with {$p}sort=sortkey",
'continue' => 'For large categories, give the value retured from previous query',
'limit' => 'The maximum number of pages to return.',
);