How to jsdoc annotate BackboneJS code?

Has anyone ever documented BackboneJS code with JSDoc?

I'm having problems annotating Backbone constructs such as:

User = Backbone.Model.extend({

    defaults: { a: 1 },

    initialize: function () {
        // ...
    },

    doSomething: function (p) {
        // ...
    }
});

Any advice appreciated. Thanks.