# RegisterExtension(IPackageManagerExtension)

> Registers a new Package Manager UI extension.

## Definition

* **Type:** Method
* **Namespace:** [UnityEditor.PackageManager.UI](/engine/6000.0/script-reference/unityeditor/packagemanager/ui.md)
* **Assembly:** UnityEditor

```csharp
public static void RegisterExtension(IPackageManagerExtension extension)
```

### Parameters

**** (\[IPackageManagerExtension]\(/engine/6000.0/script-reference/unityeditor/packagemanager/ui/ipackagemanagerextension)): A Package Manager UI extension.