diff --git a/README.md b/README.md
index 34fdebc9..a2e096ef 100644
--- a/README.md
+++ b/README.md
@@ -168,10 +168,15 @@ Hereafter described is the default *plain* format, which uses MSB bit numbering.
 	bytes 10-11:	HDOP
 	bytes 12-13:	Altitude [meter]
 
-**Port #5:** Button pressed signal
+**Port #5:** Button pressed alarm
 
 	byte 1:		static value 0x01
 
+**Port #6:** Beacon proximity alarm
+
+	byte 1:		Beacon RSSI reception level
+	byte 2:		Beacon identifier
+
 
 [**plain_decoder.js**](src/TTN/plain_decoder.js)