---
title: boundarySupplementaryItems
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nscollectionlayoutsection/boundarysupplementaryitems
---

# boundarySupplementaryItems

An array of the supplementary items that are associated with the boundary edges of the section, such as headers and footers.

## Declaration

```swift
var boundarySupplementaryItems: [NSCollectionLayoutBoundarySupplementaryItem] { get set }
```

## See Also

### Configuring additional views

- [decorationItems](appkit/nscollectionlayoutsection/decorationitems.md)