2004 voice recognition manual

[foobar]

Hello,

I've discovered my 2004 100 has voice recognition (yes I know, I've had it for three months!) so I was playing about with it on my way home tonight. It doesn't appear to be in the manual though, have I missed it or was it separate?

I've searched the forum and the rest of the Internet but despite my google-fu I can only find 120 series manuals.

Thanks