comment on code snippet in book

[NieuweNils]

Hi David!
I am working through your (so far great) book on C (Head First C), and spotted a peculiarity in the code:
in section 2.5, under "It's time for a code review", the code states:

int main()
{
char search_for[80];
printf("Search for: ");
scanf("%79s", search_for);
search_for[strlen(search_for)-1] = '\0';
find_track(search_for);
return 0;
}

where
search_for[strlen(search_for)-1] = '\0'
replaces the last inputted character.
should it be
search_for[strlen(search_for)] = '\0';
instead?