Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
we will notify our members of material changes to these terms and conditions by either sending a notice to the email address provided to us at registration or by placing a notice on our website . 

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