Afterthought is a tool to augment existing javadoc-generated documentation. It is meant to be used by the actual *users* of an API, to detail its usage, to add comments, examples and links.

Reflection after an act; later or subsequent thought.

a feature or part added to a device, not thought of in its original design.

thinking again about a choice previously made; "he had second thoughts about his purchase"

an addition that was not included in the original plan; "the garage was an afterthought"

an action taken after another action and related to the first action, which would normally or optimally be done along with the first action; -- as, to do something as an afterthought.