diff --git a/README.md b/README.md
index f0309b9..ed96ce0 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,8 @@ INSTALLED_APPS = (
     'django.contrib.admin',
     #...
 )
+
+X_FRAME_OPTIONS='SAMEORIGIN' # only if django version >= 3.0
 ```
 - Run ``python manage.py migrate``
 - Run ``python manage.py collectstatic``