params.reveal_hugo not works

[xyslope]

Hi, I am building hugo site with reveal-hugo.
It works very nice!

But in my environment,
[params.reveal_hugo] seems not working.

If I change it to the capital P, it works.
[Params.reveal_hugo]

Is this a correct behavior?

As I added my reveal-hugo pages to an existing site, some previous settings might have bad effect.