Add explanation that image is taken on iPhone 8
## Build for iOS
-<p align="center"><img width="50%" src="https://github.com/wasm3/wasm3/raw/master/extra/screenshot-ios.png"></p>
+<p align="center"><img width="50%" src="https://github.com/wasm3/wasm3/raw/master/extra/screenshot-ios.png"><br>
+ Wasm3 running on <b>iPhone 8</b>
+</p>
Install Xcode, then open and build the project as usual.
