Inform user to press escape key

We have a rich text editor that has become fairly complicated due to client requirements.

Because of this I have created the functionality of pressing the ESC key to exit the current element. Therefore if I am typing inside a <p>, pressing ESC will exit the paragraph and put the cursor immediately after it.

There is a visual cue at the bottom that mostly let's them know what elements they're currently in.

How can I inform the user that they need to press ESC?

Or is there a button/icon that I could place in the toolbar that could signify such?