The notes and commentary explain the use of optional clauses and the relevant law. (courthouselibrary.ca)
Riders are optional clauses in insurance policies which offer additional financial security by payment of a nominal extra amount over and above the premium to cover disability, death etc.. (policybazaar.com)
If the lease agreement contains an optional clause providing the hirer with a right to purchase the equipment at the end of the term, it is a hire purchase agreement. (educationbusinessuk.net)