The documentation was changed recently for IDE v1.0.1, so there were errors and omissions. They will change it if you submit a request here.
http://code.google.com/p/arduino/
It would be good for you to submit it. It is not difficult.
Here is one I submitted there, and it has been corrected, even tho it shows the status as "started".
http://code.google.com/p/arduino/issues/detail?id=880
edit: It was a bit technical for a new guy, so the request is posted:
http://code.google.com/p/arduino/issues/detail?id=1034
I knew where the functions were in the header files.