How do I prevent my iPhone from wrongly auto-correcting a specific word? When I'm writing text in Danish, the iPhone always auto-corrects foto into FOTO which is immensely annoying. How can I prevent that specific suggestion from ever showing up again?
This is iOS version 4.2.1. 

First I thought that it was matching it with an entry in my address book, but there is no contact with "FOTO" in any of the name fields. I'm using several languages, and the bad replacement only shows in Danish and not in German and not in English. I haven't tested other languages.

Because my PC with iTunes is not working well, I'd appreciate suggestions different from "try upgrading iOS it might help" unless that is a proven fix. I don't want to have to upgrade the phone unless really, really necessary.

Update:  


As noted in an answer's comment, I don't want to turn off the autocorrect -- I just want it to work right. Thanks.  
Resetting the keyboard dictionary didn't help.
Go into the keyboard settings and add a shortcut for the corrected spelling of the word.  I had to do this with my daughter's name, as every time I spelled it, it would come out in capitals.  You can just use a part of the word and it can auto spell the word for you, or you can spell it with a different capitalization and save the corrected version the other way.

If you need to use the first part of the word it may not work.  Don't really know, but it worked for me ;-)