Update README.md

Author: mrousavy

README.md

@@ -103,8 +103,8 @@ console.log(`Fibonacci Result: ${result}`)
 * You can run any JavaScript code you want in there.
 * You can use variables from "outside" (e.g. state), but those will be immutable/frozen.
 * You can use functions from "outside". 
-   - Worklets (functions with the `'worklet'` directive) can be called synchronously
-   - Normal JS functions (e.g. setState) can be called with `runOnJS`
+   - Worklets (functions with the `'worklet'` directive) can be called directly on the separate thread
+   - Normal JS functions (e.g. setState) can be called on the React-JS thread with `runOnJS`
    - Native JSI functions ("host functions") can be called synchronously (e.g. functions from [react-native-mmkv](https://github.com/mrousavy/react-native-mmkv#usage))
 * You can assign Reanimated Shared Values.