What happened with bits 4:0 in the sprite address

[Alfa]

When going through the VERA documentation on sprites I notice that each sprite record defines an address for the actual visual representation, but seems to only define bits 16-5(16:5).   What happened to bits 4-0(4:0)?  Are these just assumed to all zeros?

[SlithyMatt]

Not only are they assumed, they are required to be all zeros. So, you have to align your sprite in VRAM accordingly, at 32-byte boundaries.

[StephenHorn]

Yes, they are assumed to be zero.