Fix error in documentation
Fix error in documentation

Fixes #717

haml/haml,macressler/haml,keithpitty/haml,haml/haml,haml/haml,macressler/haml,tangposmarvin/haml,nazar-pc/haml,keithpitty/haml,dg1dd1ngs/haml,tangposmarvin/haml,stanhu/haml,nazar-pc/haml,sideci-sample/sideci-sample-haml,haml/haml,dg1dd1ngs/haml,stanhu/haml