Book-noting procedure

I'm reading a Brown Library copy of Thomas Reid's Essays on the Active Powers of the Human Mind. Someone who read this copy sometime in the past wrote, in pencil, a note in the margin. However, the note written in the margin is incorrect; the writer clearly did not understand the full implications of Hume's expressivism. Although I usually consider it wrong to write in books that are not my own (I don't even like to write in my own), I have a strong instinct to correct the note in the margin. Would I be morally justified in doing so?