While the revision history has the change, the post itself shows no indication that the dupe target has been changed. So, we have "midified"modified by muru" in the active questions page, but if you go the question, no change anywhereanytime in last year. O.o And if the question has never been edited, no link to the revision history either. Since the change is displayed as a revision, perhaps update (or add) the "edited by X" link?
Compare with the Community-bumping issue, where posts now have a notice stating the reason for the bumping. Some sort of visual indication that Mjolnir had wrought change would be nice.