There have been several times I’ve wanted to make a note of something, enter a brief note or whatever, and haven’t been able to (on the web app, the iPhone app allows it) without yet rating my mood for the day. This might be helpful in recapping why the day was a “2” or a “5” – especially if it’s something small that might have impacted the day, but might not come to mind when I’m recapping my day at 11 PM.