I am currently working on a paper in Computer Science. I am the sole author of the paper. Every aspect of the paper, the idea, the implementation, figures, plots, results are all solely based on my efforts. Since I wanted it to be accepted into a good conference/journal, I wanted it proofread. I approached a professor who is doing research somewhere close the same field (not exactly the same field) as my paper’s. He made corrections to the paper based on semantics and visual aesthetics. Should I include him as a secondary author? Is it ethically wrong if I just mention him in the acknowledgements section? How should I go about dealing with this situation?