Parties to divorce can include child support provisions in their negotiated property settlement agreements as well as spousal support.  However, there are distinguishing legal factors that must be considered when including child support terms in a settlement agreement.  While parties can agree to  non-modifiable spousal support, they cannot by law prohibit the courts from modifying child support for a minor child.  However, the courts do not have jurisdiction to modify support for a child who has reached age 18 unless it is specifically stated in the agreement that the court shall retain jurisdiction to modify it.