man: mention GPT id for LVM in pvcreate man page

man/pvcreate.8.in

@@ -48,7 +48,8 @@ can be a disk partition, whole disk, meta device, or loopback file.
 For DOS disk partitions, the partition id should be set to 0x8e using
 .BR fdisk (8),
 .BR cfdisk (8),
-or a equivalent.  For
+or a equivalent. For GUID Partition Table (GPT), the id is
+E6D6D379-F507-44C2-A23C-238F2A3DF928. For
 .B whole disk devices only
 the partition table must be erased, which will effectively destroy all
 data on that disk.  This can be done by zeroing the first sector with: