--- a/mercurial/merge.py	Thu Sep 03 14:45:16 2020 +0530
+++ b/mercurial/merge.py	Wed Aug 26 17:24:22 2020 +0530
@@ -1151,7 +1151,10 @@
 
         # Call for bids
         # Pick the best bid for each file
-        repo.ui.note(_(b'\nauction for merging merge bids\n'))
+        repo.ui.note(
+            _(b'\nauction for merging merge bids (%d ancestors)\n')
+            % len(ancestors)
+        )
         mresult = mergeresult()
         for f, bids in sorted(fbids.items()):
             # bids is a mapping from action method to list af actions