How to write java docs for tests correctly

Could you suggest how to write java docs for overloading methods unit tests? For example, there are following methods:

public CustObj retrieveCustObj(CustObjA objA, String objName) {
    //do smth;
}


public CustObj retrieveCustObj(CustObjA objA, CustObjB 
    retrieveCustObj(objA, objB.getName());
}

Thus I need to write a test for each of the methods and I need to write a comment for the ones. How to do that correctly? Thank you in advance.