diff --git a/src/custom_interfaces/srv/ChangeState.srv b/src/custom_interfaces/srv/ChangeState.srv
index 3c6fa74..e6d2dac 100644
--- a/src/custom_interfaces/srv/ChangeState.srv
+++ b/src/custom_interfaces/srv/ChangeState.srv
@@ -3,3 +3,4 @@ string state
 ---
 bool success
 string return_state
+string message