diff --git a/ESP32-C3-sm_I2C/src/config.h b/ESP32-C3-sm_I2C/src/config.h
index 7405b911e..74e30a827 100644
--- a/ESP32-C3-sm_I2C/src/config.h
+++ b/ESP32-C3-sm_I2C/src/config.h
@@ -13,7 +13,7 @@ const char* WIFI_PASSWORD = "208208208";
     RX      -> GPIO20
     TX      -> GPIO21
 
-    ADC1    -> GPIO1
+    ADC1    -> GPIO1    Used for light sensor
     ADC2    -> GPIO0
 
     A3      -> GPIO5