Using Checkbox User Attribute on Register Page

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I would like to tie the checkbox user attribute to some text that a new user to the website must agree to before creating their account - like a liability waiver or TOS that if the box isn't checked they can't create the account. The default checkbox attribute doesn't allow for all of the text to be inserted to correspond to the checkbox. Is there a way to do that or another attribute that I should be using?

The site is v5.5.2.1.

Thanks for any help!

sogren