There is already a paragraph towards the bottom that discusses how the money will be used. It could also say that you are still researching treatment options. $10,000 is an optimistic estimate for what it will cost to save your arms, and you're collecting up to $30,000 which will help you to get the best medical care possible. Any money not spent on medical care will be returned.
Just throwing out an idea. I've never run a charity campaign and don't know what works. Just make sure to get those links on webcrunchers so everyone knows that it's really you who's asking for help and not some scammer. ;-)