You'll probably have to add it to your phones dictionary. Your phone should already have it but it could have been left out in production by some glitch or accident. Addind words to your dictionary is different on individual phones. If you can't figure out how to do that then you should look on the main website of the company you bought the phone from for online tech support. I suggest online tech support as apposed to mobile support because it's not exagerated by much how useless and time consuming Call Centers are.