> For the complete documentation index, see [llms.txt](https://chat-sdk.gitbook.io/android/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://chat-sdk.gitbook.io/android/setup/module-configuration.md).

# Module Configuration

You can activate a module using:

```
Module module = ContactBookModule.shared();
```

Modules can also be configured:

```
Module module = FirebaseNearbyUsersModule.builder()
        .setMaxDistance(100)
        .build();
```

Modules can be added during Chat SDK initialization:

```
ChatSDK.builder()
        ...
        .build()
        .addModule(module)
        ...
```

Or if you're using quick start:

```
ChatSDKFirebase.quickStart(..., module);
```