Confusion about Significant Digits patterns

[Martin Green]

The Unicode LDMR reference says this about Significant Digits patterns:

    "Any number of '#' characters may be prepended to the left of the
    leftmost '@' character. These have no effect on the minimum and
    maximum significant digits counts, but may be used to position
    grouping separators. For example, "#,#@#" indicates a minimum of one
    significant digits, a maximum of two significant digits, and a
    grouping size of three."

I'm not sure I understand this, but I read this example pattern to mean 
that 1234 would be formatted as "1,200" Is this correct?

Thanks.
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