diff --git a/source/_integrations/modbus.markdown b/source/_integrations/modbus.markdown
index 687e98216a8..1f3525e1b4d 100644
--- a/source/_integrations/modbus.markdown
+++ b/source/_integrations/modbus.markdown
@@ -79,7 +79,7 @@ timeout:
   default: 5
   type: integer
 type:
-  description: Type of communication. Possible values are `tcp` Modbus messages with Modbus TCP frame on TCP/IP, `udp` Modbus messages with Modbus TCP frame on UDP, `rtuovertcp` Modbus messages with a wrapper TCP/IP simulating a serial line.
+  description: Type of communication. Possible values are `tcp` Modbus messages with Modbus TCP frame on TCP/IP, `udp` Modbus messages with Modbus TCP frame on UDP, `rtuovertcp` Modbus messages with a wrapper TCP/IP simulating a serial line, 'serial' Modbus serial (RS485).
   required: true
   type: string
 {% endconfiguration %}