# RequireSingletonForUpdate<T>()

> Obsolete. Use ComponentSystemBase.RequireForUpdate instead.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

> **Warning:**
>
> **Removed.** RequireSingletonForUpdate has been renamed. Use RequireForUpdate\\\<T\\>() instead. (RemovedAfter Entities 1.0)
>
> **Upgrade to** [ComponentSystemBase.RequireForUpdate](/engine/7000.0/script-reference/unity/entities/componentsystembase/requireforupdate.md)

```csharp
public void RequireSingletonForUpdate<T>()
```

### Remarks

**Obsolete.** Use [ComponentSystemBase.RequireForUpdate](/engine/7000.0/script-reference/unity/entities/componentsystembase/requireforupdate.md) instead.

Require that a specific singleton component exist for this system to run.