# Add(in HierarchyNode, in T)

> Adds the specified HierarchyNode and value to the HierarchyNodeMapUnmanaged<T>.

## Definition

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

## Add(HierarchyNode, T)

```csharp
public void Add(in HierarchyNode node, in T value)
```

### Parameters

**** (\[HierarchyNode]\(/engine/6000.6/script-reference/unity/hierarchy/hierarchynode)): The hierarchy node.**** (T): The value.