diff --git a/README.md b/README.md
index 3946ba8..55ac416 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@
 In order to use the LED we need to enable the SPI interface on the Rpi. 
 You can enable it by running `sudo raspi-config`, or by manually adding `dtparam=spi=on` to `/boot/firmware/config.txt`.
 Enable PWM ->  add dtoverlay=pwm to /boot/config.txt
+I²C fpr RTC `sudo raspi-config` -> interface -> enable I²C
 
 # Config