Hypenator with Twine?

Hyphenator looks like just what I want to justify my text. However, I can't seem to actually get it to work by dropping the script into a script passage and tagging paragraphs with the "hyphenate" class. I thought it might be the lack of lang flag (is that the right term?) in the HTML tag, but I added it in and it didn't help.

Has anyone else used this successfully? Or maybe someone with some more Javascript and/or Twine knowledge could help me sort it out?

Thanks in advance!