Bug#627077: Misunderstanding ?

[Scott Schaefer]

I believe you are misunderstanding ...

It seems you are interpreting the second word of "If this is not 
specified (as it normally is not) ...", to mean the (required) VALUE of 
the --size option (documented as 'Amount (in Kibibytes) of space to use 
from each drive in RAID levels 1/4/5/6').

Indeed, attempting to use --size without a subsequent value will 
(correctly) cause an error.

The second word of "If this is not specified (as it normally is not) 
..." refers to the --size option ITSELF.

That is,  --grow is normally used without specifying --size at all, in 
which case the size to which the array is grown is as described.