diff --git a/configs/features.conf.sample b/configs/features.conf.sample
index 43e4cf1a2f..57b1fa12b7 100644
--- a/configs/features.conf.sample
+++ b/configs/features.conf.sample
@@ -31,6 +31,10 @@ context => parkedcalls		; Which context parked calls are in
 				; feature activation  (default is 500 ms)
 ;atxfernoanswertimeout = 15	; Timeout for answer on attended transfer default is 15 seconds.
 
+; Note that the DTMF features listed below only work when two channels have answered and are bridged together.
+; They can not be used while the remote party is ringing or in progress. If you require this feature you can use
+; chan_local in combination with Answer to accomplish it.
+
 [featuremap]
 ;blindxfer => #1		; Blind transfer  (default is #)
 ;disconnect => *0		; Disconnect  (default is *)