The EU GDPR includes rules on providing a privacy policy for all respondents. Good practice recommendations include that this policy is:

In this policy, you should inform respondents whether the given feedback is anonymous (or not) and what their responses/ personal data is used for.

Setting a privacy policy for a specific form is possible and will overrule the general policy on that specific form only. 

Add a privacy policy on the form under 'form settings'

The privacy statement and policy URL is included in the footer of the CloseAlert form. Example;