Yes, well it's not absolutely necessary, there's no rule about it, but it's a gesture of politeness to other readers to others by adding that to your comment if you wish to talk about things that have not been known by a majority of the readers reply
YES. PLEASE DO. Also, do this thing where you put like 50 .'s in the comment, because I swear I've dropped so many mangas because someone legit spoiled the entire other half of the fucking series. reply
Yes, it is a way of being courteous to other people. You don't know if someone already knows the story, what if they're looking at the comments to see if the series is dropped and end up being spoiled? It's really rude.
(Throwback to the time someone here on mangago was really rude to me bc I included a spoiler warning in my comment on a manga. W...... 1 reply
i wanted to genuinely wanted to know what people thought about because a lot times ive seen people complaining about not putting spoilers in only to have others readers to respond with "well dont read the comments" or something along the lines. reply