diff --git a/ADC.md b/ADC.md
index 8b9b0b2b..659edf5c 100644
--- a/ADC.md
+++ b/ADC.md
@@ -1,13 +1,13 @@
-ESP chips have one ADC pin that can read analog signals. When referring to the ADC pin these terms are used interchangeably: ADC (Analog-to-digital Converter), TOUT, Pin6, A0 or Analog Pin 0.
+ESP8266 has a single ADC pin available. It may be used to read voltage at ADC pin or to read module supply voltage (VCC). > When referring to the ADC pin these terms are used interchangeably: ADC (Analog-to-digital Converter), TOUT, Pin6, A0 or Analog0.
 
-By default Tasmota allows the ADC pin to be used as an external input and assigned to a component. The signal can be interpreted as temperature, lux, potentiometer, button or "generic" voltage signal.
+By default Tasmota uses ADC pin to read voltage. The signal comes from an analog [peripheral](peripherals), or sometimes from the device itself (see [Shelly 2.5](Shelly-2.5)). The signal can be interpreted as temperature, lux, button or "generic".
 
 The reading will show in web UI's sensor section as "Analog0 %value%" and published in `tele/%topic%/SENSOR` JSON response as `"ANALOG":{"A0":%value%}`. The pin has a 10-bit resolution, which means _%value%_ can be between `0` and `1024`.
 
 ### Rule triggers
 Use these triggers in rules:    
 
-`on ANALOG#A0div10 do ...` - when the A0 input changes by more than 1% it provides a value between 0 and 100    
+`on ANALOG#A0div10 do ...` - when the ADC input changes by more than 1% it provides a value between 0 and 100    
 
 `on Tele-ANALOG#A0 do ...` - triggers on tele messages with Analog object
 > `MQT: tele/tasmota/SENSOR = {"Time":"2019-01-14T19:36:51","ANALOG":{"A0":1024}}`
@@ -15,9 +15,9 @@ Use these triggers in rules:
 Rule example: [using a potentiometer on analog pin](Rule-Cookbook#use-a-potentiometer).
 
 ## ADC_VCC
-Instead of an input, ADC pin can be used to measure internal voltage of the ESP chip. To enable this feature you need to [compile your own build](Compile-your-build):
+Instead of an input, ADC pin can be used to measure supply voltage of the ESP module (*this is reading in not 100% accurate*). To enable ADC_VCC feature you need to [compile your own build](Compile-your-build):
 
-**If you enable ADC_VCC you cannot use the pin as analog input anymore. More precisely, it is used as an analog input but for internal voltage only.**
+**If you enable ADC_VCC you cannot use the pin as analog input anymore.**
 
 user_config_override.h flag:
 ```
@@ -26,7 +26,7 @@ user_config_override.h flag:
 ```
 
 
-Internal voltage is published in `tele/%topic%/STATE` under `"Vcc":` in mV:
+Supply voltage is published in `tele/%topic%/STATE` under `"Vcc":` in mV:
 ```
 11:14:59 MQT: tele/tasmota/STATE = {"Time":"2019-10-31T11:14:59","Uptime":"0T18:36:12","UptimeSec":66972,"Vcc":3.423,"Heap":28,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":6,"POWER":"OFF","Wifi":{"AP":1,"SSId":"Tasmota","BSSId":"00:00:00:00:00:00","Channel":13,"RSSI":100,"LinkCount":1,"Downtime":"0T00:00:06"}}
 ```