What's Wrong with this Picture?

Here's the door to our basement.  See the little note William put on it?

 

Here's a closer view.

                                                                                                                                                                    

He put the sign up because our dog has discovered that there are "snacks" in the basement - leftover fishy crackers, chips that have fallen on the floor etc  - from when the kids watch TV.

The note sounds fine except ... he put the sign on the back of the door, so you can only see it when the door is shut.

This is all that you can see of the door unless you close it.

Doh!