diff --git a/src/wp-admin/custom-header.php b/src/wp-admin/custom-header.php
index 7546bb8542..238fd61e09 100644
--- a/src/wp-admin/custom-header.php
+++ b/src/wp-admin/custom-header.php
@@ -41,6 +41,10 @@ class Custom_Image_Header {
 	public $default_headers = array();
 
 	/**
+	 * Used to trigger a success message when settings updated and set to true.
+ 	 *
+	 * @since 3.0.0
+	 * @access private
 	 * @var bool
 	 */
 	private $updated;