Normally, IDEA will generate Javadocs for the whole project, or for the selected package. Unless I am missing something, there seem to be no way to generate a javadoc for only specifically selected classes. Eclipse allows you to hand-pick the classes to be included in the generated javadoc. I often find it useful when I need to accompany a design with a small javadoc that describes only the new, modified, and directly affected classes. It would be nice if IntelliJ provided this option. If it already exist, perhaps, someone could point me at it?