diff --git a/README.md b/README.md
index 052329c..3f5867b 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ LightTracker is one of the most affordable, smallest, lightest, powerful and ope
 It is able to report location, altitude, temperature and pressure to the internet (LoRaWAN networks such as Helium and TTN) or direct to another LoRa radio module with a solar panel/super capacitors or just 3xAAA batteries. 
 Because LightTracker is open source you can add your own custom sensors via I2C pins.
 
-LightTracker will be available on https://shop.qrp-labs.com/ for order soon. If you are interested in, please contact sales@lightaprs.com
+LightTracker is available on https://shop.qrp-labs.com/lighttracker for order.
 
 <img src="images/lighttracker-b-pinout.png" width="600">
 
@@ -92,8 +92,6 @@ You are almost ready to programme LightTracker :)
 
 ## Wiki
 
-We'll share more information (sample codes, guides,  etc.) soon.
-
 ### General
 
 * **[F.A.Q.](https://github.com/lightaprs/LightTracker-1.0/wiki/F.A.Q.)**
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)**