---
title: NSDocument.ChangeType.changeUndone
framework: appkit
role: symbol
role_heading: Case
path: appkit/nsdocument/changetype/changeundone
---

# NSDocument.ChangeType.changeUndone

Decrement change count.

## Declaration

```swift
case changeUndone
```

## Discussion

Discussion A single change has been undone. For example, the built-in undo support of NSDocument passes this value whenever a document receives an NSUndoManagerDidUndoChange from its own undo manager.

## See Also

### Constants

- [NSDocument.ChangeType.changeDone](appkit/nsdocument/changetype/changedone.md)
- [NSDocument.ChangeType.changeCleared](appkit/nsdocument/changetype/changecleared.md)
- [NSDocument.ChangeType.changeReadOtherContents](appkit/nsdocument/changetype/changereadothercontents.md)
- [NSDocument.ChangeType.changeAutosaved](appkit/nsdocument/changetype/changeautosaved.md)
- [NSDocument.ChangeType.changeRedone](appkit/nsdocument/changetype/changeredone.md)
- [NSDocument.ChangeType.changeDiscardable](appkit/nsdocument/changetype/changediscardable.md)