Is my post-nuptial agreement valid in New York?

My husband and I prepared a post-nuptial agreement though directions from our family court. It was signed and notarized and filed with the County Clerk. However, we were not apprised that an acknowledgment was necessary. I have significant assets; my husband has none. We have been married for six years. He has Asperger's Syndrome. I just want to end the marriage and want nothing from him--he signed a waiver not to take any of my pension funds