Document difference with Promise.all()

Fixes #27
sindresorhus · Jun 9, 2020 · 76de306 · 76de306
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diff --git a/readme.md b/readme.md
@@ -4,6 +4,8 @@
 
 Useful when you need to run promise-returning & async functions multiple times with different inputs concurrently.
 
+This is different from `Promise.all()` in that you can control the concurrency and also decide whether or not to stop iterating when there's an error.
+
 ## Install
 
 ```