Index: src/wp-includes/widgets.php
===================================================================
--- src/wp-includes/widgets.php	(revision 30733)
+++ src/wp-includes/widgets.php	(working copy)
@@ -629,18 +629,22 @@
  * This function will allow you to do so. If you don't pass the 'name' and/or
  * 'id' in $args, then they will be built for you.
  *
- * The default for the name is "Sidebar #", with '#' being replaced with the
- * number the sidebar is currently when greater than one. If first sidebar, the
- * name will be just "Sidebar". The default for id is "sidebar-" followed by the
- * number the sidebar creation is currently at. If the id is provided, and multiple
- * sidebars are being defined, the id will have "-2" appended, and so on.
- *
  * @since 2.2.0
  *
  * @see register_sidebar() The second parameter is documented by register_sidebar() and is the same here.
  *
  * @param int $number Number of sidebars to create.
- * @param string|array $args Builds Sidebar based off of 'name' and 'id' values.
+ * @param array|string $args {
+ *     Optional. Array or string of arguments for building a sidebar.
+ *
+ *     @type string $id   The base string of the unique identifier for each sidebar. If provided, and multiple
+ *                        sidebars are being defined, the id will have "-2" appended, and so on.
+ *                        Default 'sidebar-' followed by the number the sidebar creation is currently at.
+ *     @type string $name The name or title for the sidebars displayed in the admin dashboard. If registering
+ *                        more than one sidebar, include '%d' in the string as a placeholder for the uniquely
+ *                        assigned number for each sidebar.
+ *                        Default 'Sidebar' for the first sidebar, otherwise 'Sidebar %d'.
+ * }
  */
 function register_sidebars($number = 1, $args = array()) {
 	global $wp_registered_sidebars;