Not sure how long it's been there, but found this in Inspectlet's terms of service:
7. Disclosure. As soon as you begin to use Our Service, You agree to add a disclosure to either Your terms of use, user agreement and/or privacy policy to inform Your end-users and customers of Inspectlet’s access to their Personal Information through Your website, and adding a link to Our Privacy Policy which governs Our use of all such Personal Information accessed by Inspectlet through Your website or through Your use of Our Services.