@deftypefn Supplemental char* index (char *@var{s}, int @var{c})
Returns a pointer to the first occurrence of the character @var{c} in
-the string @var{s}, or NULL if not found. The use of @code{index} is
+the string @var{s}, or @code{NULL} if not found. The use of @code{index} is
deprecated in new programs in favor of @code{strchr}.
@end deftypefn