Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
because requirements may change at any time , be sure to check for up-to-date information before booking and departure . 

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