Update README.md

README.md

@@ -16,6 +16,9 @@ The core of the integration is provied by [plugp100](https://github.com/petretia
 [![License][license-shield]](LICENSE)
 [![BuyMeCoffee][buymecoffeebadge]][buymecoffee]
 
+## Warning!!!
+Although the integration works using LAN, the tapo device needs internet access to synchronize with tapo cloud, especially for credentials, a missing internet access could lead into "Invalida authentication error". Also a static IP must be set for device.
+
 ## Warning!!!
 For some unknown reason email with capital letter thrown an "Invalid authentication" error. So before open an new issue check your email address on Tapo App Settings. If contains capital letter, the integration won't work. I've opened an issue that explain this [#122](https://github.com/petretiandrea/home-assistant-tapo-p100/issues/122), I will fix asap. As workaround you can create a new account using all lower-case in your email address.