为什么git恢复对缺少的-m选项的抱怨?

So I'm working on a project with other people, and there's multiple github forks being worked on. Someone just made a fix for a problem and I merged with his fork, but then I realized that I could find a better solution. I want to revert the commit I just made. I tried doing this with So I'm working on a project with other people,