Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
be sure to return to this page periodically to review the most current version of the agreement . 

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