Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
in some cases , these communities may supplement these terms with their own terms and conditions . 

```
. OPTIONS: ['Choice of law' 'Arbitration' 'Jurisdiction' 'Unilateral termination'
 'None' 'Content removal' 'Limitation of liability' 'Unilateral change'
 'Contract by using'].