diff --git a/nova/flags.py b/nova/flags.py
index f9ebb28f..caf2d2e9 100644
--- a/nova/flags.py
+++ b/nova/flags.py
@@ -36,7 +36,7 @@ DEFINE_bool = DEFINE_bool
 # Define any app-specific flags in their own files, docs at:
 # http://code.google.com/p/python-gflags/source/browse/trunk/gflags.py#39
 
-DEFINE_string('connection_type', 'libvirt', 'libvirt or fake')
+DEFINE_string('connection_type', 'libvirt', 'libvirt, xenapi or fake')
 DEFINE_integer('s3_port', 3333, 's3 port')
 DEFINE_integer('s3_internal_port', 3334, 's3 port')
 DEFINE_string('s3_host', '127.0.0.1', 's3 host')