diff --git a/tasmota/tasmota_xdrv_driver/xdrv_63_modbus_bridge.ino b/tasmota/tasmota_xdrv_driver/xdrv_63_modbus_bridge.ino
index 5d5ac8f5d..46cb50697 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_63_modbus_bridge.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_63_modbus_bridge.ino
@@ -35,6 +35,8 @@
  *
  *   -- Write multiple coils --
  *   ModbusSend {"deviceaddress": 1, "functioncode": 15, "startaddress": 1, "type":"uint16", "count":4, "values":[1,2,3,4]}
+ * 
+ * Info for modbusBridgeTCPServer: https://ipc2u.com/articles/knowledge-base/detailed-description-of-the-modbus-tcp-protocol-with-command-examples/
 \*********************************************************************************************/
 
 #define XDRV_63 63