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Fact-checking

Despite how thoroughly you research your book, it may still contain informational inconsistencies. While editors and proofreaders can assist with this, it is ultimately not their responsibility to fact-check.

If your book contains a lot of niche information, especially if it covers a subject you have never covered before, you might want to hire a specific fact-checker to go over it. They will carefully verify each factual reference in your book with external sources, and will immediately notify you if they discover any inaccuracies.

If you write nonfiction, this stage of editing is especially important, and dedicated nonfiction editors are often experienced fact-checkers as well. However, if you're writing in a genre like hard science fiction or historical fiction, it can be very helpful to have someone else look over your manuscript for this purpose.