Update README.md

jizhuozhi · Jul 23, 2024 · 203ab5b · 203ab5b
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 The `Promise` provides a facility to store a value or an error that is later acquired asynchronously via a `Future` created by the `Promise` object. Note that the `Promise` object is meant to be used only once.
 
+Except for `Async`, all functions are event-driven, which means that no additional goroutines will be created to increase runtime scheduling overhead.
+
 ## Benchmark
 
 ```