Annotation for interface implementation

I like the @Override annotation that you use when you're overriding a method from the parent's class.
It lets you know when you look at your code that it is overridden and that it is not just some local method.
Is there something similar for methods that implement different interfaces?
Like say you implement the Comparable interface.
Wouldn't it be nice to be able to look at your code and know why some method is there?
@ImplementedFor(interfaces={"Comparable","SomeOtherInterfaceThatRequiresCompareTo"})
    public int compareTo(Object o) {
        return new Random().nextInt();
    }Note: I'm not sure about syntax or if this is possible. I only use the annotations that Eclipse generates for me.
Please, just comment or let me know if anybody has other tricks to keep their stuff more organized.

nothing in the language, but you can create your own for this purpose (and enforce it at compile-time)

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