I have been thinking about including some foreign exchange ETFs in my portfolio for some time now. I'd like to get some opinion on this to see if it's actually a good idea. I have been reading that it's better to be well diversified and how large the forex market is, so I thought this would be a decent place to start. I've already got positions in equity and bond ETFs, so I'm covered there. I think I'm well diversified already, but I always want more. Any help would be appreciated.