diff --git a/tech/ATMega328P.wiki b/tech/ATMega328P.wiki
index 704ed1a..466aeb8 100644
--- a/tech/ATMega328P.wiki
+++ b/tech/ATMega328P.wiki
@@ -266,4 +266,6 @@ internal temperture sensor. 0b1110 (10d14) is the internal reference voltage of
 values are not used
 
 To control the ADC, the ADC control and Status Register A (ADCSRA 0x7A) and ADC
-Control and Status Register B (ADCSRB 0x7B) are used.
+Control and Status Register B (ADCSRB 0x7B) are used. Bit 7 of ADCSRA (ADC
+Enable or ADEN) enables the ADC when high (1), and disables when low. 
+Setting this bit low during a conversion will stop the conversion.