Adding argument descriptions to my xlam UDFs

So I have an excel addin that is working fantasticly and the functions are great, but I'd like them to be fully integrated like the native Excel functions so that my coworkers can use the insert function tool and there will be argument descriptions (I've got the function descriptions in there already). Is there a way to add argument descriptions like that?

Also, even though I have function descriptions in there, they do not show up while typing the function in cells like native Excel functions do. Is there a way to fix that?

Thanks,