WordPress taxonomy custom orderby description

gistfile1.txt

// Custom 'orderby' for taxonomies
function customtaxorder_applyorderfilter($orderby, $args) {
    if($args['orderby'] == 'description')
        return 'tt.description';
    else
        return $orderby;
}
add_filter('get_terms_orderby', 'customtaxorder_applyorderfilter', 10, 2);