diff --git a/wp-revisions-control.php b/wp-revisions-control.php
index 2e0ae763685563c83d829599602356f907ae96a8..61715e611c779a46ec1168d6a318840ad2ab0494 100644
--- a/wp-revisions-control.php
+++ b/wp-revisions-control.php
@@ -31,8 +31,8 @@ class WP_Revisions_Control {
 	/**
 	 * Class variables
 	 */
-	private static $post_types = array();
-	private static $settings = array();
+	private static $post_types = array(); // use $this->get_post_types()
+	private static $settings = array(); // use $this->get_settings()
 
 	private $settings_page = 'writing';
 	private $settings_section = 'wp_revisions_control';