diff --git a/src/wp-includes/category-template.php b/src/wp-includes/category-template.php
index acb1625cde..9eef28efe6 100644
--- a/src/wp-includes/category-template.php
+++ b/src/wp-includes/category-template.php
@@ -292,6 +292,7 @@ function category_description( $category = 0 ) {
  * The list of arguments is below:
  *     'show_option_all' (string) - Text to display for showing all categories.
  *     'show_option_none' (string) - Text to display for showing no categories.
+ *     'option_none_value' (mixed) - Value to use when no category is selected.
  *     'orderby' (string) default is 'ID' - What column to use for ordering the
  * categories.
  *     'order' (string) default is 'ASC' - What direction to order categories.
diff --git a/src/wp-includes/user.php b/src/wp-includes/user.php
index 7eef1a57d0..c7825de08b 100644
--- a/src/wp-includes/user.php
+++ b/src/wp-includes/user.php
@@ -1252,6 +1252,7 @@ function setup_userdata($for_user_id = '') {
  * <ol>
  * <li>show_option_all - Text to show all and whether HTML option exists.</li>
  * <li>show_option_none - Text for show none and whether HTML option exists.</li>
+ * <li>option_none_value - Value to use when no option is selected.</li>
  * <li>hide_if_only_one_author - Don't create the dropdown if there is only one user.</li>
  * <li>orderby - SQL order by clause for what order the users appear. Default is 'display_name'.</li>
  * <li>order - Default is 'ASC'. Can also be 'DESC'.</li>