Some readers know implicitly what a writer is talking about and the writer does not need to explain a thing. I say this in light of an article I wrote, about how many Oscar nominations The Lord of the Rings: The Return of the King got in 2004. I didn’t even have to explain what The Return of the King was and what it was about because the readers would already know.
Although, on the off chance someone didn’t know, I thought I should have explained it, but in the end, didn’t. There was no problem with it as the editor published it anyway, probably knowing that the subject was so well known among the readership that it didn’t require anything more than a mention.