diff --git a/src/wp-admin/includes/class-bulk-plugin-upgrader-skin.php b/src/wp-admin/includes/class-bulk-plugin-upgrader-skin.php
index 9844e19460..ae9a8fe840 100644
--- a/src/wp-admin/includes/class-bulk-plugin-upgrader-skin.php
+++ b/src/wp-admin/includes/class-bulk-plugin-upgrader-skin.php
@@ -18,6 +18,11 @@
 class Bulk_Plugin_Upgrader_Skin extends Bulk_Upgrader_Skin {
 	public $plugin_info = array(); // Plugin_Upgrader::bulk_upgrade() will fill this in.
 
+	/**
+	 * Add string.
+	 *
+	 * @return void
+	 */
 	public function add_strings() {
 		parent::add_strings();
 		/* translators: 1: Plugin name, 2: Number of the plugin, 3: Total number of plugins being updated. */
@@ -25,6 +30,8 @@ class Bulk_Plugin_Upgrader_Skin extends Bulk_Upgrader_Skin {
 	}
 
 	/**
+	 * Before function.
+	 *
 	 * @param string $title
 	 */
 	public function before( $title = '' ) {
@@ -32,6 +39,8 @@ class Bulk_Plugin_Upgrader_Skin extends Bulk_Upgrader_Skin {
 	}
 
 	/**
+	 * After function.
+	 *
 	 * @param string $title
 	 */
 	public function after( $title = '' ) {
@@ -40,6 +49,7 @@ class Bulk_Plugin_Upgrader_Skin extends Bulk_Upgrader_Skin {
 	}
 
 	/**
+	 * Bulk footer.
 	 */
 	public function bulk_footer() {
 		parent::bulk_footer();