diff --git a/src/wp-includes/comment-template.php b/src/wp-includes/comment-template.php
index 5c3f0b7844..f7626f5389 100644
--- a/src/wp-includes/comment-template.php
+++ b/src/wp-includes/comment-template.php
@@ -2187,6 +2187,7 @@ function wp_list_comments( $args = array(), $comments = null ) {
  * @since 4.5.0 The 'author', 'email', and 'url' form fields are limited to 245, 100,
  *              and 200 characters, respectively.
  * @since 4.6.0 Introduced the 'action' argument.
+ * @since 4.9.6 Introduced the 'cookies' default comment field.
  *
  * @param array       $args {
  *     Optional. Default arguments and form fields to override.
@@ -2194,9 +2195,10 @@ function wp_list_comments( $args = array(), $comments = null ) {
  *     @type array $fields {
  *         Default comment fields, filterable by default via the {@see 'comment_form_default_fields'} hook.
  *
- *         @type string $author Comment author field HTML.
- *         @type string $email  Comment author email field HTML.
- *         @type string $url    Comment author URL field HTML.
+ *         @type string $author  Comment author field HTML.
+ *         @type string $email   Comment author email field HTML.
+ *         @type string $url     Comment author URL field HTML.
+ *         @type string $cookies Comment cookie opt-in field HTML.
  *     }
  *     @type string $comment_field        The comment textarea field HTML.
  *     @type string $must_log_in          HTML element for a 'must be logged in to comment' message.