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(CNN) -- When you update your status on Facebook today, you'll have one extra thing to fill out.

Now you can put whether you're an organ donor.

Facebook is allowing you to add organ donor to your timeline.

You're looking at a step-by-step guide on how to do it.

Creator Mark Zuckerberg says he got the idea, in part, through dinner conversations with his med-student girlfriend and his friendship with Apple founder Steve Jobs, who had a liver transplant.

More than 100,000 Americans are waiting for an organ right now.

Nearly seven thousand may die this year waiting.

Facebook has 900 million users around the world.