Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
under certain circumstances we may also elect to notify you of changes or updates to our terms by additional means , such as pop-up or push notifications within the products or email . 

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