diff --git a/README.md b/README.md
index 6a7b9d8..fd7ee18 100644
--- a/README.md
+++ b/README.md
@@ -149,8 +149,8 @@ Pin							FUNCTION
 							
 1							VCC (3.3v constant)
 2							GND (continuity to DC negative)
-3							TX (3.3v high, fluctuating during transmission, dead when unpowered)
-4							RX (3.3v high, fluctuating during transmission, dead when unpowered)
+3							TX (3.3v high, fluctuating during transmission while device is powered, dead when device is unpowered)
+4							RX (3.3v high, fluctuating during transmission while UART device powered, dead when UART device unpowered)
 
 Note: this has been verified with a multimeter, it is the most common used pinout layout