Backbone.js: urlRoot with http query string?

In Backbone.js I can appoint where the model fetches it's data:

var Book = Backbone.Model.extend({urlRoot : '/books'});
var mybook = new Book({id: "1"});
mybook.fetch();  //it will access '/books/1'

But if I want to append a query string after the URL? e.g. the book data is at /books/1&details=true. Can I specify this in model?