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ROL instruction comprehension

Hi,

On C55 swpu067e.pdf, page 621, it has the explanation of ROL, see below please. The last line is not clear to me. Does it mean the high 24 bits are 0s?

0000 0000 0000 0000 0000 0000 16 LSBs

Please clarify it for me. Thanks,

...............

When the destination (dst) operand is an accumulator:
if an auxiliary or temporary register is the source (src) operand of the
instruction, the 16 LSBs of the register are zero extended to 40 bits