diff --git a/tests/e2e/action_rapid_test.go b/tests/e2e/action_rapid_test.go
index 8fe91cab31..ec5bef242e 100644
--- a/tests/e2e/action_rapid_test.go
+++ b/tests/e2e/action_rapid_test.go
@@ -22,6 +22,7 @@ func TestActionMarshalling(t *testing.T) {
 }
 
 func MarshalAndUnmarshalAction(action interface{}) error {
+	// wraps the action with a step, since it needs custom unmarshalling that is called by the step unmarshaller
 	step := Step{
 		Action: action,
 	}