Java SOAP wrong return XML tag name

I have a SOAP endpoint. Something like this:

@WebMethod
public CarResourceList getAllCars() {
    ...
    CarResources carResources = ...
    CarResourceList carResourceList = new CarResourceList(carResources);
    return carResourceList;
}

And DTO:

@XmlRootElement(name="cars")
@XmlAccessorType(XmlAccessType.FIELD)
public class CarResourceList {
   ...
}

However, when I do a request I get XML with wrong tag name:

<S:Envelope xmlns:S="http://ift.tt/sVJIaE">
   <S:Body>
      <ns2:getAllCarResponse xmlns:ns2="http://ift.tt/1uKwAay">
         <return>
            <car>
               ...
            </car>
   ...

Why there is <return> tag instead of <cars>? I do not understand - I have required annotation, but tag is wrong.