diff --git a/erp5/util/testnode/SlapOSMasterCommunicator.py b/erp5/util/testnode/SlapOSMasterCommunicator.py
index c8840d158e3c64c79c98f5f7a02ec31b7b088063..50619b2d0451e487300af7e06a71c3b74250dde9 100644
--- a/erp5/util/testnode/SlapOSMasterCommunicator.py
+++ b/erp5/util/testnode/SlapOSMasterCommunicator.py
@@ -6,6 +6,8 @@ import urlparse
 
 class SlapOSMasterCommunicator(object):
   """
+  Communication with slapos Master using Hateoas.
+  
   collection: collection of data (hosting_subscription, instance, software_release...)
   hosting_subscription: result of a request
   instance(s): instance(s) related to an hosting_subscription