Clarify which versions of what we support

Author: turt2live

README.md

@@ -3,8 +3,9 @@ Riot
 
 Riot (formerly known as Vector) is a Matrix web client built using the [Matrix React SDK](https://github.com/matrix-org/matrix-react-sdk).
 
-Riot is officially supported on the web in modern versions of Chrome, Firefox, and Safari. Other browsers may work, however
-official support is not provided. For accessing Riot on an Android or iOS device, check out [riot-android](https://github.com/vector-im/riot-android)
+Riot is officially supported on the web in the last 2 major versions of Chrome, Firefox, and Safari. For Riot on Desktop (electron),
+only the officially published app is supported. Other browsers and packages may work, however official support is not provided. 
+For accessing Riot on an Android or iOS device, check out [riot-android](https://github.com/vector-im/riot-android)
 and [riot-ios](https://github.com/vector-im/riot-ios) - riot-web does not support mobile devices.
 
 Getting Started