SF 1053956: help() not in tutorial index

Doc/tut/tut.tex

@@ -4479,6 +4479,7 @@ Be sure to use the \samp{import os} style instead of
 shadowing the builtin \function{open()} function which operates much
 differently.
 
+\bifuncindex{help}
 The builtin \function{dir()} and \function{help()} functions are useful
 as interactive aids for working with large modules like \module{os}: