New row when displaying every new echo $row ['username']

I want if is possible to display the username in new row instead of one next to other (e.g. adminuser1user2

admin

user1

user2 )

$con = mysql_connect('localhost','root','');
mysql_select_db('chatbox',$con);
$sql    = "SELECT `username` 
       FROM `users` 
       ORDER BY `username` ASC";

$result = mysql_query($sql);


if($result === FALSE) { 
die(mysql_error());
}

while($row = mysql_fetch_array($result))
{
echo $row['username']; //over here
}
?>