diff --git a/Software,-environment-and-sketch-configuration.md b/Software,-environment-and-sketch-configuration.md
index d38ef47..f1da3d5 100644
--- a/Software,-environment-and-sketch-configuration.md
+++ b/Software,-environment-and-sketch-configuration.md
@@ -6,6 +6,10 @@
 # APRSDroid configuration
 - when setting up APRSDroid, use **"TNC (KISS)"** connection protocol in Connection Preferences -> Connection Protocol
 
+# LoRa library configuration
+- Decide if you want to use arduino-LoRa or RadioLib library, you have to use RadioLib library if you are NOT using `SX127x` module, uncomment `USE_RADIOLIB` in sketch if you want to use 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).
+
 # Sketch configuration
 - go to esp32_loraprs.ino and make next changes based on your requirements in `initializeConfig()`
   - set `cfg.IsClientMode` to `false` if you are planning to run server mode for APRS-IS iGate / Digipeater