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It says it on the tooltip when you mouse over it, before you read it.
+1, you're the only one to blame here.
If you play in hardmode you get among other things -25% Vitality and that will appear as Boost: -25%. If you use items that give a permanent bonus, like eating ishmashell shell raw you get Boost: +10% Water resistance, and other books/items do so in a similar way.
Except for example the +1 constitution potion. When I found it I thought, cool a perma buff to my stats. After I drank it I found out that it actually has a duration, which is not mentioned anywhere on the tooltip. I personally haven't found this book yet (thanks for the heads up), but If I did, I would have just assumed it works temporarily just like the potion, and read it anyway because I like to read everything.
Books are not potions, Reading a book and thoroughly understanding its contents can change your view on things (thus +1 int -1 perception)