Is there any attribute relating to AJAX to be set for ASP.NET MVC controller actions?

I want to use partial views with AJAX calls in ASP.NET MVC, and this is the first time I'm using it. I just searched to see if there is anything special I should know beforehand, and one of'em that I'm curious about, is to see if there is any special attribute that should be set or is related to AJAX calls? Something like [ChildActionOnly] or [HttpGet]