What does Shotwell do when I move photos inside the photo directory

I have enabled 'Watch library directory for new files' and imported many photos with the settings <Lib>/<year>/<month>/<day>/<..>.

I have since decided to move to <Lib>/<year>/<month>/<..> and would now like to clean up the old folders.

Can I simply move the files into the month folder and Shotwell will pick it up and fix it?