Ajax Question

When I keyup on my input it runs the ajax

But on success it creates a class called well multiple times as shown in image below





How can I make sure it only creates one class only even when keyup.

Code:

$('input[name=\'tags\']').on('keyup', function(e){
    $.ajax({
        url: "<?php echo base_url('questions/tags');?>",
        dataType: 'json',
        type: 'post',
        data: {
            tags: $('input[name=\'tags\']').val()
        },
        success: function(json) {
            $('<p class="well"></p>').insertAfter($("input[name='tags']"));
        }
    });

});

There's only one rule - please don't tell anyone to go and read the manual.  Sometimes the manual just SUCKS!