diff --git a/README.md b/README.md
index 596f938..6a9bc1f 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,9 @@
 # Han Mqtt Adapter
+
+### Protocol
+[link to HAN protocol](https://hanporten.se/svenska/protokollet/)
+
+### Hardware
 Han port pinout (RJ12):
 1. 5V (max 250mA)
 2. Data request (connect to 5V to enable)
@@ -7,7 +12,11 @@ Han port pinout (RJ12):
 5. Data (TX 115200 inverted open drain)
 6. GND
 
-Add pullup resistor between Pico RX pin and 3V3
+PicoW connection:
+- Connect HAN port pin 1 and 2 to pico 5V
+- Connect HAN port pin 3 and 6 to pico GND
+- Connect HAN port pin 5 to pico 1 (RX)
+- Add pullup resistor (15k) between Pico RX pin and 3V3
 
 ![front](20220814_231222.MEDIUM.jpeg)
 ![back](20220814_231229.MEDIUM.jpeg)