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TCA6424A - confusion about address

Ok, I have this GPIO expander hung off my MSP430s I2C bus, and I read the data sheet but I'm puzzled.

It says that the address is 0 1 0 0 0 1 ADDR R/W (Section 8.3.3).. then immediately after in Table 3 it says the address is either 0x22 or 0x23.

Uhm, 0 1 0 0 in the high nybble is 0x40.  Unless this is HIGH to LOW and not LOW to HIGH, which is REALLY confusing.

Can anyone shed some light on this?

Ed Averill