Class methods: describe "#my_class_method" or describe "#self.my_class_method"?

I try to have best-practice-conforming RSpec tests, and I know that when testing an instance method, one can do

describe "#my_instance_method" do ... end

But what about class methods? Should I add a self. to it in the description string?

describe "#self.my_class_method" do ... end

Thanks for your opinion!