A book group in Belgium is celebrating today after breaking a world record.
They spent a whole night setting up 4,845 books in a 600-metre domino chain before knocking them all down.
The books all had to fall in the right order for them to win the world record - and they did it!
The previous winners, from South Africa, held the title for a chain that had 2,850 books in it.
The Belgian group decided to have another go straight away using 5,500 books, but that one didn't work.
Never mind, they are still the world record holders. Check out the video.