On Facebook, how do I stop my comments on my friends' pictures from showing up the news feed?

For example: I want to comment on Friend Bob's photo, but I don't want all of my other friends to see the comment on their news feed, especially those who are not even friends with Bob! I don't necessary want my friends to see what I wrote. Some are underage family members or very religious. I know you can customize privacy settings on your status updates, but can you not do it on your comments?

placeholder text for bug in Chrome