The document discusses improving feature flags by introducing the concept of Swivel. Swivel allows features to be enabled for subsets of users by segmenting users into cohorts called "buckets" and associating features with certain buckets. This allows for more granular control over features than a simple on/off flag and enables use cases like canary deployments and A/B testing. The document outlines the basic concepts of Swivel and provides examples of how it can be implemented and used to toggle features for different buckets of users in a more maintainable way than traditional feature flags.