`git mv` is just shorthand for `git rm` and `git add`. All Git knows is that there was a file called `oldfile` and there's now a file called `newfile`, and whether or not they have similar contents or filenames. It's only when you run `git status` or `git diff` or whatever that it actually tries to guess if anything was renamed. So what you're seeing isn't the rename being recorded in history but just that guess being correct. It's easy for it to become incorrect if you make some nontrivial changes or have multiple similar files.