19.1 We're constantly trying to improve our Services, so these Terms may need to change along with the Services. We reserve the right to change the Terms at any time, but if we make any material changes, we will attempt to bring it to your attention by placing a notice on the Services, by sending you an email, or by some other means. If you don't agree with the new Terms, you are free to reject them; unfortunately, that means you will no longer be able to use the Services. If you use the Services in any way after a change to the Terms is effective, that means you agree to all of the changes.

19.2 Except for changes by us as described here, no other amendment or modification of these Terms will be effective unless in writing and signed by both you and us.