--- a/hgext/evolve.py	Mon May 02 18:24:36 2016 +0200
+++ b/hgext/evolve.py	Mon May 02 18:40:21 2016 +0200
@@ -2518,7 +2518,9 @@
         sucs = tuple(repo[n] for n in sucs)
         if not biject and len(sucs) > 1 and len(precs) > 1:
             msg = "Can't use multiple successors for multiple precursors"
-            raise error.Abort(msg)
+            hint = _("use --biject to mark a series as a replacement"
+                     " for another")
+            raise error.Abort(msg, hint=hint)
         elif biject and len(sucs) != len(precs):
             msg = "Can't use %d successors for %d precursors" \
                 % (len(sucs), len(precs))