Emacs: Rinari. How to make haml files also open in rinari-minor-mode

When using rinari, rinari-minor-mode is enabled when editing any .rb file. Though, when opening .haml files rinari-minor-mode is disabled.

How do I make emacs also automatically enable rinari-开发者_运维知识库minor-mode when editing .haml files?

Should be:

(add-hook 'haml-mode-hook 'rinari-minor-mode)