Some clarification about Spring @PathVariable annotation?

I have the following doubt using the path variable in Spring MVC.

So I have a method like this:

@RequestMapping(value = "/accounts/{accountId}", method = RequestMethod.GET)
@ResponseBody
public Account accountDetails(@PathVariable("accountId") int id) {
    return retrieveAccount(id);
}

This method handle Http Request like this one:

http://localhost:8080/rest-ws/app/accounts/0

It is pretty clear to me that the 0 into the URL become the id input parameter but my doubt is: why in this example the path variable have a name ("accountId")?

I think that I can do something like this:

    public Account accountDetails(@PathVariable int id)

or not?