After proofreading an academic textbook recently, some of which was quite complex, I was faced with one of the questions editors often have to ask themselves: Is this 'just' a proofread, or does it perhaps require some additional editorial intervention, even at this supposedly final stage of the publishing process? Where is the line between a proofreading exercise and an editing one? What I've learned over the past year or so as a newbie freelance editor is that there is some