diff --git a/src/wp-includes/customize/class-wp-widget-form-customize-control.php b/src/wp-includes/customize/class-wp-widget-form-customize-control.php
index 01acdd6c06..260b417f46 100644
--- a/src/wp-includes/customize/class-wp-widget-form-customize-control.php
+++ b/src/wp-includes/customize/class-wp-widget-form-customize-control.php
@@ -15,13 +15,68 @@
  * @see WP_Customize_Control
  */
 class WP_Widget_Form_Customize_Control extends WP_Customize_Control {
+	/**
+	 * Customize control type.
+	 *
+	 * @since 3.9.0
+	 * @var string
+	 */
 	public $type = 'widget_form';
+
+	/**
+	 * Widget ID.
+	 *
+	 * @since 3.9.0
+	 * @var string
+	 */
 	public $widget_id;
+
+	/**
+	 * Widget ID base.
+	 *
+	 * @since 3.9.0
+	 * @var string
+	 */
 	public $widget_id_base;
+
+	/**
+	 * Sidebar ID.
+	 *
+	 * @since 3.9.0
+	 * @var string
+	 */
 	public $sidebar_id;
+
+	/**
+	 * Widget status.
+	 *
+	 * @since 3.9.0
+	 * @var bool True if new, false otherwise. Default false.
+	 */
 	public $is_new = false;
+
+	/**
+	 * Widget width.
+	 *
+	 * @since 3.9.0
+	 * @var int
+	 */
 	public $width;
+
+	/**
+	 * Widget height.
+	 *
+	 * @since 3.9.0
+	 * @var int
+	 */
 	public $height;
+
+	/**
+	 * Widget mode.
+	 *
+	 * @since 3.9.0
+	 * @var bool True if wide, false otherwise. Default false.
+	 */
 	public $is_wide = false;
 
 	/**