xfs_repair doesn't fix sb versionnum missing attr

[C Linus Hicks <linush@xxxxxxxxxxx>]

I run:

xfs_check /dev/sdc10

And it reports:

sb versionnum missing attr bit 10

Then I run:

xfs_repair /dev/sdc10

And it reports output from 7 phases and "done".

Again I run:

xfs_check /dev/sdc10

And it reports:

sb versionnum missing attr bit 10

Is this how it's supposed to work?
Thanks for any help.
Linus