Dishwasher Song

My new dishwasher was finally installed and it makes a pleasant chime when you open it. Not when you close it, not when you start it or even when the cycle is complete. I’m not sure why it is telling me that I’m opening it because I am clearly opening it. Maybe it’s a safety measure to tell me someone else is opening it. Maybe a toddler who wants to climb inside? Or it could be a happy marriage indicator that your spouse is loading the dishwasher?