diff --git a/README.md b/README.md
index c063393..51d93f6 100644
--- a/README.md
+++ b/README.md
@@ -151,6 +151,8 @@ Pin							FUNCTION
 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)
+
+Note: this has been verified with a multimeter to be the most common pinout layout
 							
 							
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