Twilio’s documentation pages has a Rate this page feature at the top and bottom of the page with the option to click up to 5 stars.

Rate this page: ★ ★ ★ ★ ★.

If you do not submit a perfect rating (5 stars), a modal appears for you to send suggestions:

We are always striving to improve our documentation quality, and your feedback is valuable to us.

If you submit a 5 star rating, a modal appears with information about Twilio’s referral program:

Thanks for your feedback! Refer us and get $10 in 3 simple steps.