It will say it on the CR in the area, usually right at the bottom, of the account in question. In the same area that it might say collection account or past due XXX days. It will say something like, this account is in dispute by customer, this meets the reqirements of the FCRA. I learned in Texas they have 30 days to mark it in dispute, but otherwise no time limit other than reasonable, so give them about a month for it to be updated as disputed.