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Re:Atom – Git commit messages by raju on Monday January 12, 2015 @10:37AM (#8874407)
I believe the motivation is explained here - http://tbaggery.com/2008/04/19/a-note-about-git-commit-messa...

Write your commit message in the imperative: "Fix bug" and not "Fixed bug" or "Fixes bug." This convention matches up with commit messages generated by commands like git merge and git revert.

Re:Atom – Git commit messages by philh on Monday January 12, 2015 @12:25PM (#8875074)
That mostly just passes the buck to why do merge and revert use the imperative? Simply being consistent with them doesn't seem like a very strong argument.