--- a/cubicweb/server/hook.py	Fri Mar 10 12:07:29 2017 +0100
+++ b/cubicweb/server/hook.py	Fri Mar 10 18:24:40 2017 +0100
@@ -189,8 +189,7 @@
 `server_restore`) have a `repo` and a `timestamp` attributes, but
 *their `_cw` attribute is None*.
 
-Hooks called on session event (eg `session_open`, `session_close`) have no
-special attribute.
+Hooks called on session event (`session_open`) have no special attribute.
 
 
 API
@@ -273,7 +272,7 @@
 SYSTEM_HOOKS = set(('server_backup', 'server_restore',
                     'server_startup', 'server_maintenance',
                     'server_shutdown', 'before_server_shutdown',
-                    'session_open', 'session_close'))
+                    'session_open',))
 
 ALL_HOOKS = ENTITIES_HOOKS | RELATIONS_HOOKS | SYSTEM_HOOKS