What's the point of package annotations?

Question

I understand the purpose of class annotations, thanks to How and where are Annotations used in Java?. What is the purpose of package annotations, as described in this blog p

Answer 1

Two reasons that I can think of:

• Annotating special packages to let some aspects (for example using AspectJ) to weave the classes in them for specific functionality.
• Annotating some packages that are to be read by some tools, for example for source, meta-data or other kinds of resource generation.