chore: update IDFA docs (#895)

* update idfa docs * update idfa docs * update idfa docs --------- Co-authored-by: Niall Brennan <[email protected]>
segmentio · Dec 12, 2023 · 6adf832 · 6adf832
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diff --git a/packages/plugins/plugin-idfa/README.md b/packages/plugins/plugin-idfa/README.md
@@ -36,6 +36,8 @@ const segmentClient = createClient({
 segmentClient.add({ plugin: new IdfaPlugin() });
 ```
 
+You will need to provide a [NSUserTrackingUsageDescription](https://developer.apple.com/documentation/bundleresources/information_property_list/nsusertrackingusagedescription) key in your `Info.plist` file, for why you wish to track IDFA. An IDFA value of `0000...` will be returned on an iOS simulator.
+
 ## Customize IDFA Plugin Initialization
 
 To delay the `IDFA Plugin` initialization (ie. to avoid race condition with push notification prompt) implement the following: