diff --git a/README.md b/README.md
index 2b6cc54..9842399 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,7 @@ Built on a Xiao ESP32C3 with a Adafruit BH1750 sensor
 https://wiki.seeedstudio.com/XIAO_ESP32C3_Getting_Started/
 
 https://learn.adafruit.com/adafruit-bh1750-ambient-light-sensor/arduino
+
+The bh1750 is soldered to the 3v output on the ESP32 (red), ground is soldered to ground (black).
+The SCL (yellow) is soldered to D5 on the ESP32. SDA (green) is soldered to D4 on the ESP32.
+