add link to deprecated opengl es

README.md

@@ -74,7 +74,7 @@ function App() {
 One library to render 3D content is [expo-gl](https://docs.expo.dev/versions/latest/sdk/gl-view) usually used together with [expo-three](https://www.npmjs.com/package/expo-three). react-native-filament has a few advantages over expo-gl:
 
 - Supports using `glb` files out of the box
-- On iOS react-native-filament uses Metal, where expo-gl will use the deprecated OpenGL (as it only binds to OpenGL ES)
+- On iOS react-native-filament uses Metal, where expo-gl is using the [deprecated OpenGL ES](https://developer.apple.com/documentation/opengles) apple framework
 - The rendering happens on the JS thread for `expo-three`, where react-native-filament uses a separate thread (and filament processes the rendering commands in a pool of different threads)
 - filament is battle tested and react-native-filament is used in production apps with millions of users already, proven to be highly stable