Where I pump is an unused cubicle on a not very often used floor of my building. The past 5 days no one has come up here but today two people did and they freaked out that I was pumping. I actually don't care if people walk through / walk by the space because you can barely only see my back and I put my shirt over the parts anyway. But I feel like I need a warning sign to people without saying they can't come in at all since some people do need to pass through.