--- a/hgext3rd/evolve/evolvecmd.py	Wed Jul 17 12:47:37 2019 -0700
+++ b/hgext3rd/evolve/evolvecmd.py	Mon Jul 29 13:54:57 2019 +0200
@@ -1537,8 +1537,9 @@
     If so, evolve rebases that changeset. If not, evolve refuses to guess your
     intention, and gives a hint about what you might want to do next.
 
-    When ``--update`` is used, successful evolve operations update the
-    working directory to the newly created changesets.
+    When ``--update`` is used, successful evolve operations update the working
+    directory to the newly created changesets. Moreover, an update will always
+    be performed if the current working directory parent is obsolete.
 
     Automatic mode only handles common use cases. For example, it avoids taking
     action in the case of ambiguity, and it ignores orphan changesets that are