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# readAdditionalContent(from:)

Handles reading non-Core Data content in the additional content directory in the document’s file package.

```
func readAdditionalContent(from absoluteURL: URL) throws
```

## Parameters

`absoluteURL`

The URL for the additional content directory in the document’s file package.

## Discussion

You override this method to read non-Core Data content from the additional content directory in the document’s file package.

If you implement this method, it’s invoked automatically by [`read(from:)`](/documentation/UIKit/UIDocument/read(from:)).

There’s no need to invoke `super`’s implementation.

> Handling Errors in Swift:
> In Swift, this method is marked with the `throws` keyword to indicate that it throws an error in cases of failure.
> 
> When overriding this method, use the `throw` statement to throw an `NSError`, as described in [Error Handling](https://docs.swift.org/swift-book/LanguageGuide/ErrorHandling.html) in [The Swift Programming Language](https://docs.swift.org/swift-book/) and `About Imported Cocoa Error Parameters`.

### Special considerations

Additional content isn’t supported on iCloud.

---

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