diff --git a/src/wp-includes/ms-site.php b/src/wp-includes/ms-site.php
index 2d568a57f5..9526973510 100644
--- a/src/wp-includes/ms-site.php
+++ b/src/wp-includes/ms-site.php
@@ -30,6 +30,14 @@
  *     @type int    $spam         Whether the site is spam. Default 0.
  *     @type int    $deleted      Whether the site is deleted. Default 0.
  *     @type int    $lang_id      The site's language ID. Currently unused. Default 0.
+ *     @type int    $user_id      User ID for the site administrator. Passed to the
+ *                                `wp_initialize_site` hook.
+ *     @type string $title        Site title. Default is 'Site %d' where %d is the site ID. Passed
+ *                                to the `wp_initialize_site` hook.
+ *     @type array  $options      Custom option $key => $value pairs to use. Default empty array. Passed
+ *                                to the `wp_initialize_site` hook.
+ *     @type array  $meta         Custom site metadata $key => $value pairs to use. Default empty array.
+ *                                Passed to the `wp_initialize_site` hook.
  * }
  * @return int|WP_Error The new site's ID on success, or error object on failure.
  */