The commit graph before merging is: A--B <-master \ \ \ \ C--D--E--F <- dev git checkout master git merge dev The commit graph after merging is: A--B \ \ \ \ C--D--E--F <- dev <-master master fast-forward to commit F. I want to "undo" the merge. What shall I do? Thank you! Best regards, Hong-Ming -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html