During new user register "(Your address will be domain./.)

This is at the point where Multisite asks a new user to enter their site domain, and appears underneath the input box.

“(Your address will be domain./.) Must be at least 4 characters, letters and numbers only. It cannot be changed, so choose carefully!”

Did I set up the * hostname wrong? Shouldn’t this say something like ‘will be domain.mydomain.com?’

Thank you!