diff --git a/topic.py b/topic.py
index 88e9d40..65e1f79 100644
--- a/topic.py
+++ b/topic.py
@@ -1,5 +1,7 @@
 from collections import UserString
 
+STOP_EXECUTION_TOPIC = "TESTRUN_WHILE_DEBUG_ON/STOP_EXECUTION"
+
 #
 # Device TYpe definitions
 #