Information system adaptation is a type of system evolution that can be managed defining evolution requirements as a set of gaps with the current system. Today, most Requirements Engineering approaches for system evolution guide the modification of requirements, but very few tell how the required modifications can be elicited or even specified as such in a requirements document. This paper proposes an approach that facilitates the search and expression of evolution requirements. It advocates a business driven approach to align system adaptations to the objectives of the changing organisation. The approach is presented, then and illustrated it with an example.