diff --git a/arduino-max485-epever-json-serial.ino b/arduino-max485-epever-json-serial.ino
index 2ce4a7a..f2a2ee6 100644
--- a/arduino-max485-epever-json-serial.ino
+++ b/arduino-max485-epever-json-serial.ino
@@ -71,6 +71,9 @@
 #include <SoftwareSerial.h>
 #include "ArduinoJson.h"
 
+// when having two solar controllers, set it to true, otherwise to false
+// it is important to set it to false when only having one solar controller
+// to avoid waiting for the timeout of the second controller
 bool twoController = true;
 
 SoftwareSerial myserial(10, 11); // RX, TX