--- a/hgext3rd/evolve/__init__.py	Sun Jul 02 19:42:23 2017 +0200
+++ b/hgext3rd/evolve/__init__.py	Tue Jul 04 10:49:14 2017 +0200
@@ -96,6 +96,13 @@
     # ensuring no large repository will get affected.
     obshashrange.max-revs = 100000 # default is None
 
+For very large repositories. it is currently recommended to disable obsmarkers
+discovery (Make sure you follow release announcement to know when you can turn
+it back on).
+
+    [experimental]
+    evolution.obsdiscovery = no
+
 Effect Flag Experiment
 ======================