How can the label root be added to the ext2 file-system on /dev/sda1?

How can the label root be added to the ext2 file-system on /dev/sda1? Please enter the command
with all parameter(s) and/or option(s):

Answer: tune2fs -L

Explanation:
root /dev/sda1

From the man pages:
tune2fs – adjust tunable filesystem parameters on second extended filesystems
tune2fs [ -L volume-name ] device