sprintf() :: Where's the documetation

i saw a thread about the case to why the documentation for sprintf() is not included in the reference page. While i understand that it's a standard C fn, it is being used a lot by various developers and IMHO believe that in and of itself is a good justification to add it to the ref page.

i have many ?s about what formats of sprintf() are supported in Arduino vs not. And, a page dedicated to it, would be prudent and hugely helpful.

if there's already one, can someone please direct me to that page please.
thanks

forgot to add earlier ...just wanted to give a shoutout to
http://www.cplusplus.com/reference/cstdio/sprintf/

this site has been a good reference point for me for all std fns/libs.

I consult avr/gcc's docs:
http://www.nongnu.org/avr-libc/user-manual/group__avr__stdio.html#gaa3b98c0d17b35642c0f3e4649092b9f1