diff --git a/lorawan-otaa-pico-balloon-tracker/README.md b/lorawan-otaa-pico-balloon-tracker/README.md
new file mode 100644
index 0000000..4c08e1d
--- /dev/null
+++ b/lorawan-otaa-pico-balloon-tracker/README.md
@@ -0,0 +1,3 @@
+Before uploading "lorawan-otaa-pico-balloon-tracker.ino" sketch file to your device, you should check following guide:
+
+**[LoRaWAN OTAA Pico Balloon Tracker Guide](https://github.com/lightaprs/LightTracker-1.0/wiki/LoRaWAN-OTAA-Pico-Balloon-Tracker-Guide)**