Bootstrap form controls can have a block level help text that flows with the inputs. To add a full width block of content, use the .help-block after the <input>.
The following example demonstrates this
<!DOCTYPE html> <html> <head> <title>Bootstrap Example</title> <link href = "/bootstrap/css/bootstrap.min.css" rel = "stylesheet"> <script src = "/scripts/jquery.min.js"></script> <script src = "/bootstrap/js/bootstrap.min.js"></script> </head> <body> <form role = "form"> <span>Example of Help Text</span> <input class = "form-control" type = "text" placeholder = ""> <span class = "help-block"> A longer block of help text that breaks onto a new line and may extend beyond one line. </span> </form> </body> </html>