https://github.com/defunkt/jquery-pjax#events pjax:success | | data, status, xhr, options | after replacing HTML content loaded from the server So... This is part of args of functions. First argument alvays is JQuery event... I think we can add some examples of all arguments, like this ```js $(document).on('pjax:success', function(event, data, status, xhr, options) { console.log(event); console.log(data); console.log(status); console.log(xhr); console.log(options); }); ```