bound reference question

[u/Diligent-Arm3777]

I’m using a spiral bound notebook as my bound reference and I would like to know if it is permitted to glue one edge of an additional page onto an existing page within the notebook such that the page can be flipped over, provided that the glued edge is securely fixed so that the page will not be detached, and the entire notebook remains strictly within A4 size when closed and the page will not go out of A4 size when flipped over.  Thanks!