add some more constraints to geoNear

This is my mongoose schema -

var userDestinationSchema = mongoose.Schema({

    uid: String,                
    update_time: Date,          
    some_data: String,

    location:{                  //<INDEXED as 2d>
        lon: Number,
        lat: Number
    }
});



var userDestinationModel = mongoose.model('userDestinationModel', userDestinationSchema);

To I query the model for geoNear, I doing this.

userDestinationModel.geoNear(lng, lat, { maxDistance : 1.5 }, 
              function(err, results, stats) {
                   console.log(results);
                });

How do I add some more constraints, like a particular value of some_data?