--- a/README	Fri Jun 02 19:08:50 2017 +0200
+++ b/README	Wed Jun 14 15:59:20 2017 +0200
@@ -124,6 +124,8 @@
 6.3.2 - in progress
 -------------------
 
+ - effect flag: the experiment is now active by default,
+   (see 'hg help -e evolve' to opt out)
  - effect flag: fix a small bug related to hidden changeset,
  - obshashrange: install a '.max-revs' option see extension help for details
 

--- a/hgext3rd/evolve/__init__.py	Fri Jun 02 19:08:50 2017 +0200
+++ b/hgext3rd/evolve/__init__.py	Wed Jun 14 15:59:20 2017 +0200
@@ -102,16 +102,16 @@
 We are experimenting with a way to register what changed between a precursor
 and its successors (content, description, parent, etc...). For example, having
 this information is helpful to show what changed between an obsolete changeset
-and its tipmost successors.
+and its tipmost successors. This experiment is active by default
 
 The following config control the experiment::
 
   [experimental]
-  # activate the registration of effect flags in obs markers
-  evolution.effect-flags = yes
+  # deactivate the registration of effect flags in obs markers
+  evolution.effect-flags = false
 
 The effect flags are shown in the obglog command output without particular
-configuration of you want to inspect them.
+configuration if you want to inspect them.
 
 Templates
 =========

--- a/hgext3rd/evolve/obshistory.py	Fri Jun 02 19:08:50 2017 +0200
+++ b/hgext3rd/evolve/obshistory.py	Wed Jun 14 15:59:20 2017 +0200
@@ -528,7 +528,7 @@
     meaningful data. In the future, we can introduce way for commands to
     provide precomputed effect to avoid the overhead.
     """
-    if not repo.ui.configbool('experimental', 'evolution.effect-flags', False):
+    if not repo.ui.configbool('experimental', 'evolution.effect-flags', True):
         return orig(repo, relations, flag, date, metadata, **kwargs)
     if metadata is None:
         metadata = {}