diff --git a/ir_Denon.cpp b/ir_Denon.cpp
index 4ce6862..7c9b075 100644
--- a/ir_Denon.cpp
+++ b/ir_Denon.cpp
@@ -1,7 +1,15 @@
 #include "IRremote.h"
 #include "IRremoteInt.h"
 
-// Reverse Engineerd by looking at RAW dumps generated by IRremote
+// Reverse Engineered by looking at RAW dumps generated by IRremote
+
+// I have since discovered that Denon publish all their IR codes:
+//  https://www.google.co.uk/search?q=DENON+MASTER+IR+Hex+Command+Sheet
+//  -> http://assets.denon.com/documentmaster/us/denon%20master%20ir%20hex.xls
+
+// Having looked at the official Denon Pronto sheet and reverse engineered
+// the timing values from it, it is obvious that Denon have a range of
+// different timings and protocols ...the values here work for my AVR-3801 Amp!
 
 //==============================================================================
 //                    DDDD   EEEEE  N   N   OOO   N   N