diff --git a/consume.go b/consume.go
index db36ece..248eee3 100644
--- a/consume.go
+++ b/consume.go
@@ -22,6 +22,8 @@ const (
 	NackDiscard
 	// NackRequeue deliver this message to a different consumer.
 	NackRequeue
+	// Message acknowledgement is left to the user using the msg.Ack() method
+	Manual
 )
 
 // Consumer allows you to create and connect to queues for data consumption.