Reviewer feedback, peer review and cover letters

You pressed submit, waited weeks, and the email finally arrives. You open the reviewers’ comments and they aren’t what you hoped. Some are helpful, some are vague, and one or two feel unfair. How you respond decides whether the paper moves forward.

This guide covers three things that belong together: the reviewer comments you are most likely to see and how to answer them, why peer review is worth engaging with properly, and how a good cover letter sets up the whole process.

Part 1: Common reviewer comments and how to answer them

General advice says “be polite and address every point”. That’s true, but it doesn’t tell you what to do with a specific comment. Here are the comments I see most often, what they usually mean, and how to respond.

“The contribution to the field is unclear”

This usually happens when the author assumes the value of the findings is obvious. It rarely is to someone outside your project.

How to answer it: state your contribution in plain words in both the introduction and the conclusion: “This study contributes to the field by…” or “This research fills a gap in…”. Then go one step further and say who can use the result.

Example: if your research looks at the effects of climate change on agriculture, don’t stop at the findings. Explain what they mean for policymakers or farmers, and what practice they could change.

“The literature review is incomplete”

This often points to key studies you missed. Sometimes it means the reviewer feels their own work, or a study they consider central, has been left out.

How to answer it: go back to the literature. Make sure you have covered the main debates and the foundational studies. Add the suggested references that genuinely strengthen your argument, and explain briefly why you haven’t added any that don’t fit your focus. Don’t respond by piling on citations.

Example: if your paper is on social media and adolescent mental health, and a reviewer suggests studies on digital wellbeing, read them properly. Include the ones that add something, and say in your response letter why the others fall outside your scope.

“The methodology is not detailed enough”

The reviewer either can’t tell how the study was done, or isn’t sure it was done soundly.

How to answer it: describe your design, sampling, data collection and analysis clearly enough that another researcher could repeat the study from your description alone.

Example: if you used a complex survey design, explain how the questionnaire was built, what was asked, how participants were selected and how the data were analysed. “A survey was conducted” is never enough.

“The results lack depth of interpretation”

The reviewer wants to know what your numbers mean, not just what they are.

How to answer it: in the discussion, explain how your findings fit with, or challenge, existing work, what their practical implications are, what their limitations are, and what questions they open for future research. Be careful not to claim more than your design allows.

Example: if your results show a drug reduced symptoms, discuss why that matters, where it might be applied, what your study could not show, and what should be tested next.

Other comments you will meet

• “The figures or tables are unclear.” Simplify them, label every axis and column, and make sure each one can be understood on its own.
• “There are too many minor errors.” Take this seriously. Small errors make reviewers wonder what else was done carelessly. Proofread the whole paper again, ideally with a fresh reader.

When comments contradict each other

Feedback can be vague or contradictory. If one reviewer says your topic is too broad and another says it is too narrow, look for the common thread. Often the real problem is that the paper doesn’t state its scope clearly. Fix that, and explain in your response how you have addressed both comments.

Don’t rush the revision

It is tempting to make quick changes and resubmit. Reviewers can tell when their points haven’t been fully dealt with. Even when you disagree with a comment, engage with it: explain your reasoning politely and, where you can, support it with evidence or a reference.

Write a point-by-point response

Create a response document that lists every comment, followed by your reply and exactly what you changed (with page and line numbers). It shows the editor and reviewers that you took their time seriously, and it makes their second reading much easier.

Part 2: Why peer review is worth taking seriously

Peer review can feel like a hurdle. It is more useful to see it as a free, expert reading of your work. I used to dread reviewer comments; now I treat them as a shortcut to a better paper.

It protects the quality of what gets published

Reviewers check your methods, data and conclusions so that flawed studies and unsupported claims are caught before publication. That protects readers, and it protects you: a weakness found by a reviewer is far less damaging than one found after publication.

It gives you a fresh perspective

After months or years on a project, it is easy to miss your own assumptions. A reviewer reads the paper as an outsider would.

Example: a researcher studying social behaviour might not notice how cultural context shapes their findings. A reviewer from a different region may point it out, and the analysis becomes more careful and more convincing.

It can shape your next study

Good reviewers don’t only critique the current paper; they point to gaps worth filling.

Example: a study on virtual reality in education might get a comment asking about long-term outcomes. That comment can become your next research question.

It builds credibility and teaches you

Work that has been through rigorous review carries more weight with readers. And every round of reviews teaches you something about how your field reads and judges research, which makes your next paper stronger.

Part 3: Why the cover letter matters

Many researchers treat the cover letter as a formality: introduce the paper, summarise it, confirm it hasn’t been published elsewhere. Those things are needed, but a good cover letter does more. It is your chance to make a short, clear case for the paper.

It is the editor’s first impression

Editors handle many submissions and decide quickly whether a paper fits their journal. A clear cover letter helps them see the fit straight away.

Example: submitting to a journal on sustainable agriculture? Mention the debate or gap your research addresses, and where the journal has published related work.

It explains why the work matters now

Don’t just say “This research contributes to X.” Say why it matters at this moment: a current debate, a policy question, a new problem.

Example: if your research is on climate change and coastal ecosystems, point to its implications for policy, conservation and community planning.

It can answer obvious questions early

If there is something an editor might worry about, such as a new method or a modest sample, address it briefly and honestly. Acknowledge the limitation and explain why the study is still sound.

Example: if you used a new methodology, explain in a sentence why it suits your question.

It establishes credibility, briefly

Mention relevant previous work, collaborations or funding where they help the editor trust the study. One or two lines is enough; don’t turn the letter into a CV.

It can help the editor choose reviewers

A clear description of your research focus helps the editor send the paper to reviewers with the right expertise. Most journals also let you name people who should not review your paper because of a conflict of interest, either in the submission system or in the letter.

Example: “Because of a recent collaboration, we would ask that Dr X not be invited to review this manuscript.”

Keep it short

A cover letter should fit on one page. Address the editor by name if you can, give the title, state the main finding and why it suits the journal, confirm the required declarations, and stop.

In short

Reviewer feedback is one of the most valuable things you will get for your paper. Read it calmly, look for what each comment is really asking, answer every point in a clear response document, and treat the cover letter as the start of that conversation rather than an afterthought. If you are still choosing where to send your paper, start with my guide to choosing a journal and getting your manuscript submitted.