diff --git a/srv/TSTExecutorExpand.srv b/srv/TSTExecutorExpand.srv
index d156d6752378ba5681cfa0cefe519dda04a0350f..77c4a0acf91f1f6a745328b56888bf6bbd637871 100644
--- a/srv/TSTExecutorExpand.srv
+++ b/srv/TSTExecutorExpand.srv
@@ -6,8 +6,10 @@ string ns       # Namespace for the tstfactory
 int32 id        # id for the TST node in the tstfactory
 int32 free_id	# First free unique id
 string[] possible_units		# List of posssible units. Needed to declare constraints vars.
+int32	 expansion_try
 ---
 int32 free_id	# Returns the first free unique id in the delegation
+int32 expansion_can_be_tried
 bool success
 int32 error
 string reason