Add note about async and multiple hooks

tj · May 9, 2021 · f2f9390 · f2f9390
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commit f2f9390
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diff --git a/Readme.md b/Readme.md
@@ -574,6 +574,8 @@ program
   });
 ```
 
+The callback hook can be `async`, in which case you call `.parseAsync` rather than `.parse`. You can add multiple hooks per event.
+
 The supported events are:
 
 - `beforeAction`: called before action handler for this command and its subcommands