--- a/hgext3rd/evolve/__init__.py	Tue Jul 04 10:49:14 2017 +0200
+++ b/hgext3rd/evolve/__init__.py	Thu Jul 06 23:33:28 2017 +0200
@@ -77,6 +77,11 @@
   # (recommended 'yes' for server (default))
   obshashrange.warm-cache = no
 
+The initial cache warming is currently a bit slow. To make sure it is build you
+can run the following commands in your repository::
+
+    $ hg debugobshashrange --rev 'head()
+
 It is recommended to enable the blackbox extension. It gathers useful data about
 the experiment. It is shipped with Mercurial so no extra install is needed::