---
title: "SystemDependency.before(_:)"
framework: realitykit
role: symbol
role_heading: Case
path: "realitykit/systemdependency/before(_:)"
---

# SystemDependency.before(_:)

An update order that requests RealityKit update this system before it updates another specified system.

## Declaration

```swift
case before(any System.Type)
```

## Parameters

- `System`: A system that this system updates before.

## Mentioned in

Implementing systems for entities in a scene

## See Also

### Update order

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