My question involves paternity law for the State of: Maryland

I was married to Husband A at the time of my son’s birth. Husband A is listed as the father on my son’s birth certificate but he is not my son’s biological father. Husband A and I have been divorced for 8 years now. Husband B is the biological father of my son. What do I need to do to list Husband B as the father on my son’s birth certificate? Is it as easy as completing an Affidavit of Parentage, getting it notarized and submitted to the Division of Vital Records? (By the way, my son was born in Maryland and we now live in Virginia.)

My son is 13 and this is long over due!

Thank you!!