IFWiki:Spoiler warning
From IFWiki
A Spoiler Warning indicates that the descriptive text of an entry may contain details, locations or answers to puzzles that will seriously hamper your enjoyment or surprise in relation to the plot or structure of a work. Discussion of a complete work will necessarily include details not immediately obvious, and as such any item with a spoiler warning should be avoided until you are no longer interested in working out puzzles or details yourself.