Typo in documentation on training data rules?

Hi, I am starting this days to play with Rasa Open Source and when I tried to reproduce the third example here (Training Data & Rules – Rasa Learning Center) I got an error message like this:

Blockquote xpected , but found ‘-’ in “data/stories.yml”, line 15, column 3: - checkpoint: check_greetAndName … ^ (line: 15)

Could it be that the tag steps: is missing in the two last stories? Or was it something else?