diff --git src/wp-includes/category-template.php src/wp-includes/category-template.php
index 438bbe9966..2e44fd7143 100644
--- src/wp-includes/category-template.php
+++ src/wp-includes/category-template.php
@@ -468,9 +468,9 @@ function wp_dropdown_categories( $args = '' ) {
  *              optionally accept an array of values.
  *
  * @param string|array $args {
- *     Array of optional arguments.
+ *     Array of optional arguments. See get_categories(), get_terms(), and WP_Tax_Query::construct()
+ *     for full lists of arguments that can be passed in `$args`.
  *
- *     @type int          $child_of              Term ID to retrieve child terms of. See get_terms(). Default 0.
  *     @type int|array    $current_category      ID of category, or array of IDs of categories, that should get the
  *                                               'current-cat' class. Default 0.
  *     @type int          $depth                 Category depth. Used for tab indentation. Default 0.
@@ -486,15 +486,8 @@ function wp_dropdown_categories( $args = '' ) {
  *     @type string       $feed_image            URL of an image to use for the feed link. Default empty string.
  *     @type string       $feed_type             Feed type. Used to build feed link. See get_term_feed_link().
  *                                               Default empty string (default feed).
- *     @type bool|int     $hide_empty            Whether to hide categories that don't have any posts attached to them.
- *                                               Default 1.
  *     @type bool         $hide_title_if_empty   Whether to hide the `$title_li` element if there are no terms in
  *                                               the list. Default false (title will always be shown).
- *     @type bool         $hierarchical          Whether to include terms that have non-empty descendants.
- *                                               See get_terms(). Default true.
- *     @type string       $order                 Which direction to order categories. Accepts 'ASC' or 'DESC'.
- *                                               Default 'ASC'.
- *     @type string       $orderby               The column to use for ordering categories. Default 'name'.
  *     @type string       $separator             Separator between links. Default '<br />'.
  *     @type bool|int     $show_count            Whether to show how many posts are in the category. Default 0.
  *     @type string       $show_option_all       Text to display for showing all categories. Default empty string.
@@ -503,7 +496,6 @@ function wp_dropdown_categories( $args = '' ) {
  *     @type string       $style                 The style used to display the categories list. If 'list', categories
  *                                               will be output as an unordered list. If left empty or another value,
  *                                               categories will be output separated by `<br>` tags. Default 'list'.
- *     @type string       $taxonomy              Taxonomy name. Default 'category'.
  *     @type string       $title_li              Text to use for the list title `<li>` element. Pass an empty string
  *                                               to disable. Default 'Categories'.
  *     @type bool|int     $use_desc_for_title    Whether to use the category description as the title attribute.