diff --git a/src/wp-admin/includes/meta-boxes.php b/src/wp-admin/includes/meta-boxes.php
index c52b4787a3044..52f43d0b685f4 100644
--- a/src/wp-admin/includes/meta-boxes.php
+++ b/src/wp-admin/includes/meta-boxes.php
@@ -1677,25 +1677,31 @@ function register_and_do_post_meta_boxes( $post ) {
 	 *
 	 * @since 3.0.0
 	 *
-	 * @param string  $post_type Post type.
-	 * @param WP_Post $post      Post object.
+	 * @param string                    $object_type The type of the current object that meta boxes were added to.
+	 *                                               Can be 'post', 'page', custom post types, 'comment', or 'link'.
+	 * @param WP_Post|WP_Comment|object $object      The post, comment, or link object. Type varies depending on
+	 *                                               `$object_type`.
 	 */
 	do_action( 'add_meta_boxes', $post_type, $post );
 
 	/**
 	 * Fires after all built-in meta boxes have been added, contextually for the given post type.
 	 *
-	 * The dynamic portion of the hook name, `$post_type`, refers to the post type of the post.
+	 * The dynamic portion of the hook name, `$post_type`, refers to the post type of the post,
+	 * or the object type (comment, link).
 	 *
 	 * Possible hook names include:
 	 *
 	 *  - `add_meta_boxes_post`
 	 *  - `add_meta_boxes_page`
 	 *  - `add_meta_boxes_attachment`
+	 *  - `add_meta_boxes_comment`
+	 *  - `add_meta_boxes_link`
 	 *
 	 * @since 3.0.0
 	 *
-	 * @param WP_Post $post Post object.
+	 * @param WP_Post|WP_Comment|object $object The post, comment, or link object. Type varies depending on
+	 *                                          the hook name.
 	 */
 	do_action( "add_meta_boxes_{$post_type}", $post );
 
@@ -1706,11 +1712,11 @@ function register_and_do_post_meta_boxes( $post ) {
 	 *
 	 * @since 3.0.0
 	 *
-	 * @param string                $post_type Post type of the post on Edit Post screen, 'link' on Edit Link screen,
-	 *                                         'dashboard' on Dashboard screen.
-	 * @param string                $context   Meta box context. Possible values include 'normal', 'advanced', 'side'.
-	 * @param WP_Post|object|string $post      Post object on Edit Post screen, link object on Edit Link screen,
-	 *                                         an empty string on Dashboard screen.
+	 * @param string                $object_type Post type of the post on Edit Post screen, 'link' on Edit Link screen,
+	 *                                           'dashboard' on Dashboard screen.
+	 * @param string                $context     Meta box context. Possible values include 'normal', 'advanced', 'side'.
+	 * @param WP_Post|object|string $object      Post object on Edit Post screen, link object on Edit Link screen,
+	 *                                           an empty string on Dashboard screen.
 	 */
 	do_action( 'do_meta_boxes', $post_type, 'normal', $post );
 	/** This action is documented in wp-admin/includes/meta-boxes.php */