How to add speaker notes to reveal

I came across to a great HTML Presentation Framework: reveal.js, which is a framework used to create stunning presentations using either a visual editor or simple text.

Its create flexibility allows me to create my slides using Markdown

and convert everything by using Pandoc

How can I add a note to my speaker notes, so that can be visible only to me, but not my audience?
By using:

 <div class="notes">
  This is my note.
  Note: This will only appear in the speaker notes window.

When the presentation starts, press s to see speaker notes.