man nice, info nice

[Dan Jacobson]

$ info nice does not get one info about nice(1), instead it is some C thing.

$ man nice
       Run COMMAND with an adjusted scheduling priority.  With no COMMAND, 
print the current
       scheduling priority.  ADJUST is 10 by default.  Range goes from -20  
(highest  prior-
       ity) to 19 (lowest).

       -n, --adjustment=ADJUST
              increment priority by ADJUST first

Well, maybe I know what you are trying to say, but maybe add examples:
A practical one, and these:
$ nice
0
$ nice nice
10
$ nice -n 10 nice #default
10
$ nice -n 30 nice #hits max
19
$ nice -n -22 nice #only root can
nice: cannot set priority: Permission denied

Probably put these on a Info page.