Index: src/wp-includes/category-template.php
===================================================================
--- src/wp-includes/category-template.php	(revision 40901)
+++ src/wp-includes/category-template.php	(working copy)
@@ -275,27 +275,17 @@
  * @since 4.6.0 Introduced the `required` argument.
  *
  * @param string|array $args {
- *     Optional. Array or string of arguments to generate a categories drop-down element.
+ *     Optional. Array or string of arguments to generate a categories drop-down element. See WP_Term_Query::__construct()
+ *     for information on additional accepted arguments.
  *
  *     @type string       $show_option_all   Text to display for showing all categories. Default empty.
  *     @type string       $show_option_none  Text to display for showing no categories. Default empty.
  *     @type string       $option_none_value Value to use when no category is selected. Default empty.
- *     @type string       $orderby           Which column to use for ordering categories. See get_terms() for a list
- *                                           of accepted values. Default 'id' (term_id).
- *     @type string       $order             Whether to order terms in ascending or descending order. Accepts 'ASC'
- *                                           or 'DESC'. Default 'ASC'.
  *     @type bool         $pad_counts        See get_terms() for an argument description. Default false.
  *     @type bool|int     $show_count        Whether to include post counts. Accepts 0, 1, or their bool equivalents.
  *                                           Default 0.
- *     @type bool|int     $hide_empty        Whether to hide categories that don't have any posts. Accepts 0, 1, or
- *                                           their bool equivalents. Default 1.
- *     @type int          $child_of          Term ID to retrieve child terms of. See get_terms(). Default 0.
- *     @type array|string $exclude           Array or comma/space-separated string of term ids to exclude.
- *                                           If `$include` is non-empty, `$exclude` is ignored. Default empty array.
  *     @type bool|int     $echo              Whether to echo or return the generated markup. Accepts 0, 1, or their
  *                                           bool equivalents. Default 1.
- *     @type bool|int     $hierarchical      Whether to traverse the taxonomy hierarchy. Accepts 0, 1, or their bool
- *                                           equivalents. Default 0.
  *     @type int          $depth             Maximum depth. Default 0.
  *     @type int          $tab_index         Tab index for the select element. Default 0 (no tabindex).
  *     @type string       $name              Value for the 'name' attribute of the select element. Default 'cat'.
@@ -307,7 +297,6 @@
  *                                           of the option elements. Accepts any valid term field: 'term_id', 'name',
  *                                           'slug', 'term_group', 'term_taxonomy_id', 'taxonomy', 'description',
  *                                           'parent', 'count'. Default 'term_id'.
- *     @type string|array $taxonomy          Name of the category or categories to retrieve. Default 'category'.
  *     @type bool         $hide_if_empty     True to skip generating markup if no categories are found.
  *                                           Default false (create select element even if no categories are found).
  *     @type bool         $required          Whether the `<select>` element should have the HTML5 'required' attribute.