How about :help user-functions
I'll add a reference at the end of 41.7.
--
hundred-and-one symptoms of being an internet addict:
22. You've already visited all the links at Yahoo and you're halfway through
Lycos.
/// Bram Moolenaar -- Br...@Moolenaar.net --
http://www.Moolenaar.net \\\
/// \\\
\\\ sponsor Vim, vote for features --
http://www.Vim.org/sponsor/ ///
\\\ help me help AIDS victims --
http://ICCF-Holland.org ///