[header] How to add an addendum to a will [title] Identify a significant life event you want to account for. [step] If you are recently remarried or have had more children, then you should account for your new spouse and children in the will. [substeps] Typically, any gift to a former spouse is revoked automatically on divorce. 
Nevertheless, you should draft a new will to redistribute any gifts formerly designated for your ex-spouse to new beneficiaries. The general rule today is that a prior will is not automatically revoked because you are married.