diff --git a/includes/admin/class-wc-admin-settings.php b/includes/admin/class-wc-admin-settings.php
index 70848e2153237..a2e47396141b5 100644
--- a/includes/admin/class-wc-admin-settings.php
+++ b/includes/admin/class-wc-admin-settings.php
@@ -19,8 +19,25 @@
  */
 class WC_Admin_Settings {
 
+	/**
+	 * Setting pages.
+	 *
+	 * @var array
+	 */
 	private static $settings = array();
+
+	/**
+	 * Error messages.
+	 *
+	 * @var array
+	 */
 	private static $errors   = array();
+
+	/**
+	 * Update messages.
+	 *
+	 * @var array
+	 */
 	private static $messages = array();
 
 	/**