Generally, if you purchase a home during a marriage with marital funds, the home is jointly owned by you and your spouse. (info.legalzoom.com)
Active appreciation is appreciation in separate property that is caused by contributions of marital funds or marital efforts. (nlrg.com)
However, it can also address rules for the relationship during the marriage, such as how marital funds will be spent, and how the spouses will treat one another. (familydiplomacy.com)