How to tell ReSharper that my PublicAPI class should NOT be marked sealed

I am writing some libraries for consumption externally.

I choose to mark them as PublicAPI since many of the (public/protected) methods are never invoked from *my* solution.

However, ReSharper insists of informing me that I can seal the classes in question.

Since, PublicAPI suggest that my methods *may* be in use elsewhere (or via reflectrion), why does it also suggest I can seal the class?

I would prefer adding attributes, since I can also validate these externally (FxCop/Gendarme etc) rather than via comments