The 0.9989 BTC will include change. On the review transaction screen if you click show advanced you can see all the inputs and outputs which will be used.
You should see 0.05 BTC going to the intended address and 0.9489 BTC being returned back to you as change.
Thanks, I wasn't familiar with the change element of Bitcoin: https://en.bitcoin.it/wiki/Change . I'm not sure I'll ever understand it but all I need to know is that I will receive change in another address. I'm assuming that there are zero fees to move money around unless I choose to pay the miners fee?
