diff --git a/ClusterController/ClusterStatus.py b/ClusterController/ClusterStatus.py
index 4cc60f9..b300eac 100644
--- a/ClusterController/ClusterStatus.py
+++ b/ClusterController/ClusterStatus.py
@@ -138,7 +138,7 @@ class ClusterStatus:
 		"""
 		fEnergyConsumption = 0.0
 		for machine in self.m_clusterNodes.itervalues():
-			if machine.isReady():
+			if machine.isReady(): # there are cases where the machine is not ready yet (for example, it's just been added to clustercontroller's control)
 				fEnergyConsumption += machine.getEnergyConsumption()
 		return fEnergyConsumption