Vector register 23?

[Ngan, Robert (DXC Luxoft)]

Under "Saving the caller program's registers", the assembler services guide 
states:

Vector registers (VRs) 8 - 15, bytes 0 - 7, and the entirety of VRs 16 - 23 are 
unchanged.

16-23 only! Not 16-31. Is this correct?

Robert Ngan
DXC Luxoft