diff --git a/README.md b/README.md
index 1b2e381..81559c9 100644
--- a/README.md
+++ b/README.md
@@ -9,3 +9,6 @@ The main components here are wired up like this:
 - The HD44780 16x2 display is connected to an I2C daughterboard, which itself is connected to +5V, ground, as well as the I2C bus pins of the ESP32, 22 for clock and 21 for data
 - The SCD40/41 photoacoustic NDIR CO2 sensor is connected to +5V and ground for power and to pins 22 and 21 (ESP32 I2C_bus1; MH-Z19B side pins SCL and SDA respectively)
 - A button to toggle the backlight is connected between pin 23 and ground
+
+## Setup
+The device will open a WiFi hotspot on first boot, connecting to which reveals a setup dialog for WiFi information, OpenWeatherMap API key & coordinates (this is for collecting pressure information to feed to the SCD4x sensor)