diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -61,6 +61,9 @@ Total length of `RC_DATA` payload is 9 bytes
 **TX** sends `PING` frame with curent `micros`. If **RX** receives `PING` frame, it respons
 its payload as `PONG` frame. 
 
+# TX module connection diagram
+
+![Diagram](docs/TX_module_schem.png)
 
 # RX module connection diagram
 
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