Why do we have to name interface method parameters?

Question

In C# we have to name the parameters of a method of an interface.

I understand that even if we didn\'t have to, doing so would help a reader understand the meaning,

Answer 1

Naming interface method parametres helps with self documentation:

For example ...

interface IRenderable
{
    void Render(TimeSpan gameTime);
}

... says more than:

interface IRenderable
{
    void Render(TimeSpan);
}