I wish they would use a more readable notation of labels on those edges in the rendered diagram. Instead of that Crow's Foot notation, just put numbers there (like "1", "n", "m", or if you want to specify even more detail "0..1", "1..1", "1..n", "m..n") and one only needs to remember in which direction to read, not also what some kind of weird notation means. Crow's Foot notation makes the ER diagrams look somewhat unclean.

EDIT: Even the wikipedia[1] example[2] is kind of wrong: A song can be performed by many artists over time.

[1]: https://en.wikipedia.org/wiki/Entity%E2%80%93relationship_mo...

[2]: https://en.wikipedia.org/wiki/File:ERD-artist-performs-song....