diff --git a/Software,-environment-and-sketch-configuration.md b/Software,-environment-and-sketch-configuration.md
index 1be2e8f..9114780 100644
--- a/Software,-environment-and-sketch-configuration.md
+++ b/Software,-environment-and-sketch-configuration.md
@@ -50,4 +50,13 @@
 
 # BLE support
 - iOS does not support serial over Bluetooth and requires BLE support, this enables APRS applications such as official aprs.fi to work with the modem
-- to enable BLE support set `cfg.BtEnableBle` to `true`
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+- to enable BLE support set `cfg.BtEnableBle` to `true`
+
+# USB serial support
+- Enable USB serial support by setting `cfg.UsbSerialEnable/CFG_USB_SERIAL_ENABLE` to `true`
+- When USB serial is enable Bluetooth and TCP/IP KISS server will be disabled
+
+# KISS over TCP/IP
+- Enable KISS over TCP/IP server by setting `KissEnableTcpIp/CFG_KISS_TCP_IP` to `true`
+- Bluetooth is NOT going to be disabled if enabled by setting name in `cfg.BtName/CFG_BT_NAME`
+- Default port is 8001
\ No newline at end of file