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:
   _  __   _  __  __  __   __  ___   __  ___
  / |/ /  / |/ / / / / /  /  |/  /  /  |/  /
 /    /  /    / / /_/ /  / /|_/ /  / /|_/ / 
/_/|_/  /_/|_/  \____/  /_/  /_/  /_/  /_/