title: Git reverse commit a pushed merge in SourceTree
body: <p>I accidentally merged a branch and had "Push changes immediately" checked. Unfortunately I made a merge error and now I wan't to make a reverse commit to remove it. However every time I do it in SourceTree I get the following error:</p>
  
  <blockquote>
    <p>error: Commit X is a merge but no -m option was given. fatal:
    revert failed</p>
  </blockquote>
  
  <p>Is there any way to do this or do I have to use the terminal for this? Been reading about it but could not find a solution to this specific case.</p>