diff --git a/FroalaEditorWidget.php b/FroalaEditorWidget.php
index b6f6998..21cba70 100644
--- a/FroalaEditorWidget.php
+++ b/FroalaEditorWidget.php
@@ -160,6 +160,7 @@ protected function initClientOptions()
             'htmlSimpleAmpersand',
             'iframe',
             'iframeStyle',
+            'iframeStyleFiles',
             'imageAllowedTypes',
             'imageAltButtons',
             'imageDefaultAlign',