root partition does not auto extend

[disk91]

/root # df -h Filesystem Size Used Available Use% Mounted on /dev/root 210.5M 188.2M 5.0M 97% / devtmpfs 453.9M 0 453.9M 0% /dev tmpfs 91.7M 68.0K 91.6M 0% /run

[disk91]

sounds like a reboot after resize is needed as the partition finally appear as expanded after no action ... other than rebooting