Block show the default VtigerCRM Confirmation box to let them decide something.
You could configure the text, the User see.
This configuration result into this in Frontend:

Enter your comment. Wiki syntax is allowed:
   ____   ____   __      __   _  __
  / __/  / __/  / /  __ / /  / |/ /
 / _/   / _/   / /__/ // /  /    / 
/___/  /___/  /____/\___/  /_/|_/