Co-workers that make me want to bang my head on the desk

Me, Friday, to QA guy half-way across the world: (bracket bits are translations; bold is just for this post)

Note that if you wish to [run only part of our product for testing purposes], you can run [program] with the switch -loader-only, which will cause it to [do only part of the work]. There's also [some other stuff useful for testing]

QA guy back to us today:

[Recalling context of phone call where he talked about how it wasn't working]
Could I also check whether the following commands are correct to [do testing-type things].
...
To [do some testing thing]:
[program] -loder -only [other arguments]

Ouch. What's worse is that the output from our program when you give it unrecognized options is a usage message that lists each option it accepts.

If I'd said this on the phone, I suppose I could understand, but this was in email...