diff --git a/src/wp-admin/includes/class-wp-media-list-table.php b/src/wp-admin/includes/class-wp-media-list-table.php
index 5e26ebb9e118b..4ff73328d50f8 100644
--- a/src/wp-admin/includes/class-wp-media-list-table.php
+++ b/src/wp-admin/includes/class-wp-media-list-table.php
@@ -22,9 +22,20 @@ class WP_Media_List_Table extends WP_List_Table {
 	 * @var array
 	 */
 	protected $comment_pending_count = array();
-
+	/**
+	 * Whether the list table is for detached media.
+	 *
+	 * @since 3.1.0
+	 * @var bool
+	 */
 	private $detached;
 
+	/**
+	 * Whether the list table is for trash.
+	 *
+	 * @since 3.1.0
+	 * @var bool
+	 */
 	private $is_trash;
 
 	/**
@@ -53,6 +64,10 @@ public function __construct( $args = array() ) {
 	}
 
 	/**
+	 * Checks if the current user has permissions to upload files.
+	 *
+	 * @since 3.1.0
+	 *
 	 * @return bool Whether the user can upload files.
 	 */
 	public function ajax_user_can() {
@@ -60,10 +75,14 @@ public function ajax_user_can() {
 	}
 
 	/**
+	 * Prepares the list of items for displaying.
+	 *
+	 * @since 3.1.0
+	 *
 	 * @global string   $mode                  List table view mode.
 	 * @global WP_Query $wp_query              WordPress Query object.
-	 * @global array    $post_mime_types
-	 * @global array    $avail_post_mime_types
+	 * @global array    $post_mime_types       An array of post mime types.
+	 * @global array    $avail_post_mime_types An array of available post mime types.
 	 */
 	public function prepare_items() {
 		global $mode, $wp_query, $post_mime_types, $avail_post_mime_types;
@@ -117,8 +136,12 @@ public function prepare_items() {
 	}
 
 	/**
-	 * @global array $post_mime_types
-	 * @global array $avail_post_mime_types
+	 * Gets an array of links for the available views on this table.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @global array $post_mime_types       An array of post mime types.
+	 * @global array $avail_post_mime_types An array of available post mime types.
 	 * @return array<string, string> An array of links for the available views.
 	 */
 	protected function get_views() {
@@ -198,7 +221,11 @@ protected function get_bulk_actions() {
 	}
 
 	/**
-	 * @param string $which
+	 * Displays extra controls between bulk actions and pagination.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param string $which The location of the extra table nav: 'top' or 'bottom'.
 	 */
 	protected function extra_tablenav( $which ) {
 		if ( 'bar' !== $which ) {
@@ -253,6 +280,9 @@ public function has_items() {
 	}
 
 	/**
+	 * Displays a message when no media items are found.
+	 *
+	 * @since 3.1.0
 	 */
 	public function no_items() {
 		if ( $this->is_trash ) {
@@ -762,8 +792,12 @@ protected function get_default_primary_column_name() {
 	}
 
 	/**
-	 * @param WP_Post $post
-	 * @param string  $att_title
+	 * Gets the row actions for a media item.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param WP_Post $post      The current WP_Post object.
+	 * @param string  $att_title The attachment title.
 	 * @return array<string, string> An array of row actions.
 	 */
 	private function _get_row_actions( $post, $att_title ) {
diff --git a/src/wp-admin/includes/class-wp-ms-sites-list-table.php b/src/wp-admin/includes/class-wp-ms-sites-list-table.php
index 9214927bee9f8..afee923fd60e7 100644
--- a/src/wp-admin/includes/class-wp-ms-sites-list-table.php
+++ b/src/wp-admin/includes/class-wp-ms-sites-list-table.php
@@ -50,7 +50,11 @@ public function __construct( $args = array() ) {
 	}
 
 	/**
-	 * @return bool
+	 * Checks if the current user has permissions to manage sites.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return bool Whether the user can manage sites.
 	 */
 	public function ajax_user_can() {
 		return current_user_can( 'manage_sites' );
@@ -62,7 +66,7 @@ public function ajax_user_can() {
 	 * @since 3.1.0
 	 *
 	 * @global string $mode List table view mode.
-	 * @global string $s
+	 * @global string $s    Search string.
 	 * @global wpdb   $wpdb WordPress database abstraction object.
 	 */
 	public function prepare_items() {
@@ -206,6 +210,9 @@ public function prepare_items() {
 	}
 
 	/**
+	 * Displays a message when no sites are found.
+	 *
+	 * @since 3.1.0
 	 */
 	public function no_items() {
 		_e( 'No sites found.' );
@@ -286,7 +293,11 @@ protected function get_views() {
 	}
 
 	/**
-	 * @return array
+	 * Gets an associative array of bulk actions for this table.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return array An associative array of bulk actions.
 	 */
 	protected function get_bulk_actions() {
 		$actions = array();
@@ -300,6 +311,10 @@ protected function get_bulk_actions() {
 	}
 
 	/**
+	 * Displays the pagination.
+	 *
+	 * @since 3.1.0
+	 *
 	 * @global string $mode List table view mode.
 	 *
 	 * @param string $which The location of the pagination nav markup: Either 'top' or 'bottom'.
@@ -359,6 +374,10 @@ protected function extra_tablenav( $which ) {
 	}
 
 	/**
+	 * Gets an array of column titles keyed by their column name.
+	 *
+	 * @since 3.1.0
+	 *
 	 * @return string[] Array of column titles keyed by their column name.
 	 */
 	public function get_columns() {
@@ -386,7 +405,11 @@ public function get_columns() {
 	}
 
 	/**
-	 * @return array
+	 * Gets an array of sortable columns.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return array An array of sortable columns.
 	 */
 	protected function get_sortable_columns() {
 
@@ -640,7 +663,7 @@ public function display_rows() {
 	 *
 	 * @since 5.3.0
 	 *
-	 * @param array $site
+	 * @param array $site The site to get states for.
 	 */
 	protected function site_states( $site ) {
 		$site_states = array();