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# UICollectionLayoutListConfiguration.HeaderMode.supplementary

A header mode that uses supplementary views to show headers.

```
case supplementary
```

## Discussion

Choose this header mode to use supplementary views with [`elementKindSectionHeader`](/documentation/UIKit/UICollectionView/elementKindSectionHeader) as the section header.

By default, lists that use the [`UICollectionLayoutListConfiguration.Appearance.plain`](/documentation/UIKit/UICollectionLayoutListConfiguration-swift.struct/Appearance-swift.enum/plain) and [`UICollectionLayoutListConfiguration.Appearance.sidebarPlain`](/documentation/UIKit/UICollectionLayoutListConfiguration-swift.struct/Appearance-swift.enum/sidebarPlain) list appearances use pinned headers. You must use this header mode if you want to opt into this default pinning behavior.

---

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