Documentation missing for several org-habit variables?

[Christian Heinrich]

Hi everyone,

I noticed that https://orgmode.org/manual/Tracking-your-habits.html explains 
only a few variables
that exist in org-agenda.el and that are declared via defvar.

However, in org-habit.el, more variables exist but are declared via defcustom. 
I cannot find any
documentation (online) on, e.g., org-habit-today-glyph.

Is this correct / are you aware of this or should the documentation for these 
variables be added as
well?

Best regards
Christian