Agile Overview → Backlogs → Release Backlog
A release backlog should only contain a work item that could be committed to by a team for work in a sprint. A work item can be added to the release backlog from the product backlog. A work item in a release backlog should be discussed with team members during release planning meetings. A work item should be estimated, broken down into a smaller work item, become more detailed, and so on, before the beginning of the next sprint.
A work item can be moved between a product and a release backlog as needed, such as when business priorities change or when opportunities to create better business value arise. A work item in a release backlog can be added, edited, and removed; however, any work item in a release backlog should have a high priority and a high business value. In general, only well-defined stories should be moved into a sprint backlog from a release backlog.