diff --git a/signal.h b/signal.h
index 58bebb9..628b05a 100644
--- a/signal.h
+++ b/signal.h
@@ -27,6 +27,6 @@ public:
 	uint8_t getState();
 	uint8_t getSubaddress();
 	uint16_t getPacket();
-	void sendData();
+	void sendData(bool single = false);
 	uint8_t getType();
 };