I needed to repair my I Photo library. I went to an Apple store and was told to hold down option, command and I Photo. At that point, a photo repair pop up appeared on my screen. I checked what I needed and then hit repair. How do I know ...

I needed to repair my I Photo library because I discovered a photo was corrupted while making a book. I went to an Apple store and was told to hold down option, command and I Photo. At that point, a Photo Library Repair pop-up appeared on my screen. I did as the Apple tutor directed, and that night, checked all the boxes. Then I hit repair and let the program do what it needed to do. How can I tell that the repair was successful? When I looked again, the screen just showed my last photo entered but there was no other message. Thanks for your help...