--- a/doc/tutorials/advanced/part03_bfss.rst	Thu Feb 21 19:08:44 2019 +0100
+++ b/doc/tutorials/advanced/part03_bfss.rst	Thu Feb 21 18:46:39 2019 +0100
@@ -22,6 +22,7 @@
     from cubicweb.server import hook
     from cubicweb.server.sources import storages
 
+
     class ServerStartupHook(hook.Hook):
         __regid__ = 'sytweb.serverstartup'
         events = ('server_startup', 'server_maintenance')