diff --git a/src/wp-admin/includes/class-wp-ms-users-list-table.php b/src/wp-admin/includes/class-wp-ms-users-list-table.php
index b4cbf8457a0b4..fca80f439ca66 100644
--- a/src/wp-admin/includes/class-wp-ms-users-list-table.php
+++ b/src/wp-admin/includes/class-wp-ms-users-list-table.php
@@ -16,16 +16,24 @@
  */
 class WP_MS_Users_List_Table extends WP_List_Table {
 	/**
-	 * @return bool
+	 * Checks if the current user has permissions to perform an Ajax action.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return bool Whether the current user can perform an Ajax action.
 	 */
 	public function ajax_user_can() {
 		return current_user_can( 'manage_network_users' );
 	}
 
 	/**
+	 * Prepares the users list for display.
+	 *
+	 * @since 3.1.0
+	 *
 	 * @global string $mode       List table view mode.
-	 * @global string $usersearch
-	 * @global string $role
+	 * @global string $usersearch User search query.
+	 * @global string $role       The user role to filter by.
 	 */
 	public function prepare_items() {
 		global $mode, $usersearch, $role;
@@ -106,7 +114,11 @@ public function prepare_items() {
 	}
 
 	/**
-	 * @return array
+	 * Gets the available bulk actions for the users list table.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return array<string, string> An associative array of bulk actions.
 	 */
 	protected function get_bulk_actions() {
 		$actions = array();
@@ -120,14 +132,22 @@ protected function get_bulk_actions() {
 	}
 
 	/**
+	 * Displays a message when there are no items.
+	 *
+	 * @since 3.1.0
 	 */
 	public function no_items() {
 		_e( 'No users found.' );
 	}
 
 	/**
-	 * @global string $role
-	 * @return array
+	 * Gets the list of views (all, super admin) available for the users list table.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @global string $role The user role to filter by.
+	 *
+	 * @return array<string, string> An associative array of views.
 	 */
 	protected function get_views() {
 		global $role;
@@ -170,9 +190,13 @@ protected function get_views() {
 	}
 
 	/**
+	 * Generates the list table pagination.
+	 *
+	 * @since 3.1.0
+	 *
 	 * @global string $mode List table view mode.
 	 *
-	 * @param string $which
+	 * @param string $which The location of the pagination: 'top' or 'bottom'.
 	 */
 	protected function pagination( $which ) {
 		global $mode;
@@ -185,7 +209,11 @@ protected function pagination( $which ) {
 	}
 
 	/**
-	 * @return string[] Array of column titles keyed by their column name.
+	 * Gets the list of columns for the users list table.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return array<string, string> Array of column titles keyed by their column name.
 	 */
 	public function get_columns() {
 		$users_columns = array(
@@ -202,13 +230,18 @@ public function get_columns() {
 		 * @since MU (3.0.0)
 		 *
 		 * @param string[] $users_columns An array of user columns. Default 'cb', 'username',
-		 *                                'name', 'email', 'registered', 'blogs'.
+		 * @param array<string, string> $users_columns An array of user columns. Default 'cb', 'username',
+		 *                                             'name', 'email', 'registered', 'blogs'.
 		 */
 		return apply_filters( 'wpmu_users_columns', $users_columns );
 	}
 
 	/**
-	 * @return array
+	 * Gets the list of sortable columns for the users list table.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return array<string, array{0: string, 1: bool, 2: string, 3: string, 4?: string}> Sortable columns.
 	 */
 	protected function get_sortable_columns() {
 		return array(
@@ -349,12 +382,14 @@ public function column_registered( $user ) {
 	}
 
 	/**
+	 * Outputs the sites column content.
+	 *
 	 * @since 4.3.0
 	 *
-	 * @param WP_User $user
-	 * @param string  $classes
-	 * @param string  $data
-	 * @param string  $primary
+	 * @param WP_User $user    The current WP_User object.
+	 * @param string  $classes CSS classes for the cell.
+	 * @param string  $data    Custom data attributes for the cell.
+	 * @param string  $primary The primary column name.
 	 */
 	protected function _column_blogs( $user, $classes, $data, $primary ) {
 		echo '<td class="', $classes, ' has-row-actions" ', $data, '>';
diff --git a/src/wp-admin/includes/class-wp-plugin-install-list-table.php b/src/wp-admin/includes/class-wp-plugin-install-list-table.php
index a029d725d7b75..ba276b346f8f5 100644
--- a/src/wp-admin/includes/class-wp-plugin-install-list-table.php
+++ b/src/wp-admin/includes/class-wp-plugin-install-list-table.php
@@ -23,7 +23,11 @@ class WP_Plugin_Install_List_Table extends WP_List_Table {
 	private $error;
 
 	/**
-	 * @return bool
+	 * Checks if the current user has permissions to perform an Ajax action.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return bool Whether the current user can perform an Ajax action.
 	 */
 	public function ajax_user_can() {
 		return current_user_can( 'install_plugins' );
@@ -80,11 +84,15 @@ protected function get_installed_plugin_slugs() {
 	}
 
 	/**
-	 * @global array  $tabs
-	 * @global string $tab
-	 * @global int    $paged
-	 * @global string $type
-	 * @global string $term
+	 * Prepares the plugins list for display.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @global array  $tabs  The tabs shown on the Add Plugins screen.
+	 * @global string $tab   The current active tab.
+	 * @global int    $paged The current page number.
+	 * @global string $type  The type of search being performed.
+	 * @global string $term  The search term.
 	 */
 	public function prepare_items() {
 		require_once ABSPATH . 'wp-admin/includes/plugin-install.php';
@@ -287,6 +295,9 @@ public function prepare_items() {
 	}
 
 	/**
+	 * Outputs the message when no plugins are found.
+	 *
+	 * @since 3.1.0
 	 */
 	public function no_items() {
 		if ( isset( $this->error ) ) {
@@ -307,10 +318,14 @@ public function no_items() {
 	}
 
 	/**
-	 * @global array $tabs
-	 * @global string $tab
+	 * Gets the list of views (tabs) available for the plugins list table.
 	 *
-	 * @return array
+	 * @since 3.1.0
+	 *
+	 * @global array<string, string> $tabs The tabs shown on the Add Plugins screen.
+	 * @global string                $tab  The current active tab.
+	 *
+	 * @return array<string, string> Array of view links keyed by their ID.
 	 */
 	protected function get_views() {
 		global $tabs, $tab;
@@ -330,7 +345,9 @@ protected function get_views() {
 	}
 
 	/**
-	 * Overrides parent views so we can use the filter bar display.
+	 * Displays the view (tabs) switcher for the plugins list table.
+	 *
+	 * @since 3.1.0
 	 */
 	public function views() {
 		$views = $this->get_views();
@@ -395,9 +412,13 @@ public function display() {
 	}
 
 	/**
-	 * @global string $tab
+	 * Generates the table navigation.
 	 *
-	 * @param string $which
+	 * @since 3.1.0
+	 *
+	 * @global string $tab The current active tab.
+	 *
+	 * @param string $which The location of the pagination: 'top' or 'bottom'.
 	 */
 	protected function display_tablenav( $which ) {
 		if ( 'featured' === $GLOBALS['tab'] ) {
@@ -431,23 +452,35 @@ protected function display_tablenav( $which ) {
 	}
 
 	/**
-	 * @return array
+	 * Gets the list of CSS classes for the table container.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return string[] CSS classes.
 	 */
 	protected function get_table_classes() {
 		return array( 'widefat', $this->_args['plural'] );
 	}
 
 	/**
-	 * @return string[] Array of column titles keyed by their column name.
+	 * Gets the list of columns for the plugins list table.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @return array<string, string> Array of column titles keyed by their column name.
 	 */
 	public function get_columns() {
 		return array();
 	}
 
 	/**
-	 * @param object $plugin_a
-	 * @param object $plugin_b
-	 * @return int
+	 * Callback for sorting plugins.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param object $plugin_a The first plugin object.
+	 * @param object $plugin_b The second plugin object.
+	 * @return int Comparison result.
 	 */
 	private function order_callback( $plugin_a, $plugin_b ) {
 		$orderby = $this->orderby;