---
title: SystemDependency
framework: realitykit
role: symbol
role_heading: Enumeration
path: realitykit/systemdependency
---

# SystemDependency

Defines update order relative to other systems. An object that specifies the update order between multiple systems.

## Declaration

```swift
enum SystemDependency
```

## Overview

Overview Add instances of SystemDependency to your system’s dependencies array to indicate whether RealityKit updates another specified system before or after this system.

## Topics

### Update order

- [SystemDependency.before(_:)](realitykit/systemdependency/before(_:).md)
- [SystemDependency.after(_:)](realitykit/systemdependency/after(_:).md)

### Operators

- [==(_:_:)](realitykit/systemdependency/==(_:_:).md)

## Relationships

### Conforms To

- [Equatable](swift/equatable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Specifying dependencies

- [dependencies](realitykit/system/dependencies.md)