Adding a heading before multiple check boxes in landing page forms

I was using the radio buttons in a landing page but I realise that you can only choose one option and I need multiple options to be selected. I am now using check boxes but they don’t have a little heading to introduce them. I want it to look as followings:
Please confirm which of the following products you have (select all the ones you have):

  • A
  • B
  • C
  • D

Can anyone help?