No warning when grub-btrfs is run without ever running grub-mkconfig before

[Schievel1]

If someone misses the warning in the readme that says
"NOTE: All distros
Generate your grub menu after installation for the changes to take effect."
the entry in /boot/grub/grub.cfg that defines the menu item in grub to get to grub-btrfs submenu is not present.
When /etc/grub.d/41_snapshots-btrfs is run, the script seems to be running fine, there is no warning about the user should run grub-mkconfig at least once.

Also the instructions in the readme about that could be a little clearer. It is never mentioned that the snapshots can be created with /etc/grub.d/41_snapshots-btrfs for example.