diff --git a/docs/projects/radio-bridge.md b/docs/projects/radio-bridge.md
index 3acf8002..e9124e8c 100644
--- a/docs/projects/radio-bridge.md
+++ b/docs/projects/radio-bridge.md
@@ -1,5 +1,7 @@
 # Radio bridge
 
+Transfer the packet data received from the radio to the serial port. Use buttons **A** and **B** to select a radio group number.
+
 ```typescript
 /**
 * Download this code and connect the device to the computer.
@@ -33,4 +35,4 @@ input.onButtonPressed(Button.B, function () {
 })
 group = 128
 radio.setGroup(group)
-```
\ No newline at end of file
+```