Awkward. Need advice.

So my husband decided to masterbate before bed, but didn’t close the bedroom door, well as I walked down the hall, I see my 8 year old standing there (after I had already put her to bed) and I know she saw him... he was watching porn on his phone so the room wasn’t completely dark. I haven’t said anything to my idiot husband yet, but I’m so angry! Close the fucking door!!! How do I go about talking to her about that?? She didn’t say anything, but she was acting “weird” when I asked her why she was out of bed. Please help!!