Agile methodologies have impact not only on coding,but also on requirements engineering activities. In the paper agile requirements engineering is examined from the research point of view. It is claimed that use cases are a better tool for requirements description than user stories as they allow zooming through abstraction levels, can be reused for user manual generation, and when used properly can provide quite good effort estimates. Moreover, as it follows from recent research, parts of use cases (namely event descriptions) can be generated in an automatic way. Also the approach to non-functional requirements can be different. Our experience shows that they can be elicited very fast and can be quite stable.