% of daycare cost for custodial and noncustodial parents?

My ex and I have 2 kids. We have a child support order in place. She forgot to bring up the cost of daycare when her and I wrote up the agreement with the court. We both signed the agreement and went in front of the judge. Judge asked if there was anything else and we both said no. Now because she forgot to bring up daycare in the meeting we have to either write up an agreement between eachother or go back to court so she can get some money from me for daycare. What would be better to do? Whats the % each parent will have to pay for daycare costs if we went through court? Should I make her go back through court or should I write an agreement with her? If it were me that forgot to bring up something in court she would most likely tell me its my problem. What do you think?