Update README.md

Co-authored-by: Philip Gichuhi <[email protected]>

README.md

@@ -113,7 +113,7 @@ try {
 
 ```
 
-> Note: The SDK is designed to make async requests by default, to get the result object add `wait()` after the operation.
+> Note: The SDK is designed to make async requests by default. Operations (`get()`, `post()`...) return a [Promise](https://docs.php-http.org/en/latest/components/promise.html). To get the result, call `wait()` after the operation.
 > Example: `->get()->wait();`
 
 Note that to calling `me()` requires a signed-in user and therefore delegated permissions (obtained using the `authorization_code` flow):