# UpdateNeeded

> Whether the hierarchy view model requires an update.

## Definition

* **Type:** Property
* **Namespace:** [Unity.Hierarchy](/engine/6000.6/script-reference/unity/hierarchy.md)
* **Assembly:** UnityEngine.HierarchyCoreModule

```csharp
public bool UpdateNeeded { get; }
```

### Remarks

This happens when the underlying hierarchy changes topology.