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I have a suggestion in PCI.

I had been worked PCI successfully by read that wiki but someone can be confuse such as me by just a 'word' so I want to make exact.

In top of Figure2, 3 and 4, the tables, 'register' need to change to 'byte' or 'byte offset', I think.

The word, 'register' already connote that 'size is 4bytes(32bits)' because already explained about register size before.
and the other table headers mean 32bits.
Thus, if remain that 'word' at that location, value of registers such as 00, 04, 08 and so on need to change to 0, 1, 2, 3 and so on.

In real code, if want to access 3rd register that has Class code, Subclass etc., do not use 08 as register value of Config register. Just use 2.
so changing the values is better.

Normally, I would agree that Offset makes more sense than Register in this context. However, the problem is that "Register" is the terminology used in the PCI specifications, I believe.

So I'm fine with leaving it as-is. Maybe just change the column header to "Register (offset)"?