After removing a physical volume from a machine, and returning the physical volume back to the machine, the physical volume is ignored and the following message appears:
[root@emma ~]# pvscan
WARNING: VG vg001 was previously updated while PV /dev/sdc was missing.
WARNING: VG vg001 was missing PV /dev/sdc HeNyWe-Efmc-Lb0R-L8w5-nVp7-aPSs-Ntbs0Z.
How do I add the physical volume back to the volume group?