diff --git a/docs/en/api-reference/peripherals/adc.rst b/docs/en/api-reference/peripherals/adc.rst
index ee6f98a6dc..972c1f0c9a 100644
--- a/docs/en/api-reference/peripherals/adc.rst
+++ b/docs/en/api-reference/peripherals/adc.rst
@@ -114,7 +114,7 @@ Calibration Values
 
 Calibration values are used to generate characteristic curves that account for the unique ADC reference voltage of a particular ESP32. There are currently three sources of calibration values. The availability of these calibration values will depend on the type and production date of the ESP32 chip/module.
 
-**Two Point** values represent each of the ADCs’ readings at 150mV and 850mV. These values are measured and burned into eFuse ``BLOCK3`` during factory calibration.
+**Two Point** values represent each of the ADCs’ readings at 150mV and 850mV. To obtain more accurate calibration results these values should be measured by user and burned into eFuse ``BLOCK3``.
 
 **eFuse Vref** represents the true ADC reference voltage. This value is measured and burned into eFuse ``BLOCK0`` during factory calibration.