# 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 initilization:
```
ChatSDK.builder()
...
.build()
.addModule(module)
...
```
Or if you're using quick start:
```
ChatSDKFirebase.quickStart(..., module);
```