[qubes-users] What is Stage 6 in the upgrade process?

In performing an in-place upgrade of my 4.0 system, I’m following the instructions on qubes-os.org;

The upgrade consists of 7 stages - 6 before restarting the system - marked as “STAGE 0” through “STAGE 6” in the options list below. And the 7th stage is rebuilding the applications and features list - started with a --resync-appmenus-features option.

But in the documentation, there is no stage 6. It only has stages 0 - 5. Is it a type-o and it’s safe to reboot after stage 5?

(Pastebin of the command’s help output here)