My personal cent: Some tools strongly suggest that your commit messages should not exceed 50 characters in the first line, and 80 characters on every other line. While the 80-character rule makes sense if you’re using a terminal (and someone on your team will even if you don’t), I strongly disagree with the 50-character rule. If you want to be in any way clear what you did, 50 characters is simply not enough even for the subject line.