JQuery add more data to serialized data for AJAX

So if you get a serialized hash from a form submission or other means and want to add more information before you you send it to your headache free server; please do as bellow ':data' section

$.ajax({
   type: 'post', 
   url: "http://iamfree.com/nice_day",
   data: $(this).sortable('serialize') + '&user_id=' + the_var +'&location=Melbourne' , 
   dataType: "script",
   complete: function(request){
                $('#sortable').effect('highlight');
             },
 
   }
 });

 
 data: var_serialized_data + '&hello=you&nice=Day&whats=dinner&fancy=muffins',

var formInfo =$( this ).serialize() + '&user_id=' + the_var

console.log(formInfo);