diff --git a/observer/messages/collector.go b/observer/messages/collector.go
index 19eefcf..e373bfe 100644
--- a/observer/messages/collector.go
+++ b/observer/messages/collector.go
@@ -1,6 +1,7 @@
 package messages
 
 const (
-	COLLECTED         = "COLLECTED"
-	COLLECTOR_STOPPED = "COLLECTOR_STOPPED"
+	COLLECTED           = "COLLECTED"
+	COLLECTOR_STOPPED   = "COLLECTOR_STOPPED"
+	REMOVE_SENSOR_2_END = "REMOVE_SENSOR_2_END"
 )