In my team, we often complete an MVP feature, i.e. MVP for Authentication. It has all the stuff it needs to be compliant and work, and meets the definition of done.
Then somewhere down the line, someone asks for something else, i.e. log out after x seconds. This is a single user story, which fits under the feature of 'Authentication'. I have usually by this point closed that feature and marked it as done, since it has met the definition of done. It doesn't seem right to add this new story under a closed feature.
So do I create a new feature for this one user story? How would you guys manage this small amount of incremental work in your backlog?