diff --git a/Software,-environment-and-sketch-configuration.md b/Software,-environment-and-sketch-configuration.md
index 1c590bb..a9102ff 100644
--- a/Software,-environment-and-sketch-configuration.md
+++ b/Software,-environment-and-sketch-configuration.md
@@ -8,6 +8,8 @@
 
 ![alt text](https://raw.githubusercontent.com/sh123/esp32_loraprs/master/images/aprsdroid.png)
 
+- Use **TNC (plaintext TNC2)** for interoperability with text based LoRa APRS projects, set `cfg.EnableTextPackets/CFG_TEXT_PACKETS` to `true` to enable this modem mode of operation
+
 # LoRa library configuration
 - Decide if you want to use [arduino-LoRa](https://github.com/espressif/arduino-esp32) or [RadioLib](https://github.com/jgromes/RadioLib) library, you have to use RadioLib library if you are NOT using `SX127x` module, uncomment `USE_RADIOLIB` in `loraprs_service.h` if you want to use [RadioLib](https://github.com/jgromes/RadioLib)
   - If you are using RadioLib and not using SX1278 module then modify module declarations in `loraprs_service.cpp` and `loraprs_service.h` find and replace `SX1278` with your module name. Read more about supported modules at [RadioLib Wiki](https://github.com/jgromes/RadioLib/wiki).