diff --git a/Carrier-sense-multiple-access-(CSMA).md b/Carrier-sense-multiple-access-(CSMA).md
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--- a/Carrier-sense-multiple-access-(CSMA).md
+++ b/Carrier-sense-multiple-access-(CSMA).md
@@ -1,3 +1,5 @@
+![alt text](https://raw.githubusercontent.com/sh123/esp32_loraprs/master/images/csma.png)
+
 - Carrier detection is used when sketch is built based on RadioLib library with `USE_RADIOLIB` flag
  - Also, additional flag `cfg.LoraUseCad/CFG_LORA_USE_CAD`) must be set to `true`
 - CSMAp is utilized by this project as per KISS specification. TX path is executed only when there is no incoming data returned by `LoRa::parsePacket` and TX path is executed with probability p (CSMA persistence), configured by const `Loraprs::Service::CfgCsmaPersistence` in `loraprs_service.h`. Random value is selected between 0 and 255 and TX is executed only when it is lower than `CfgCsmaProbBoundary`.