diff --git a/defaults.go b/defaults.go
index 2d97f290..09331c9f 100644
--- a/defaults.go
+++ b/defaults.go
@@ -24,7 +24,9 @@ func (dns *Msg) SetReply(request *Msg) *Msg {
 	return dns
 }
 
-// SetQuestion creates a question message.
+// SetQuestion creates a question message, it sets the Question
+// section, generates an Id and sets the RecursionDesired (RD)
+// bit to true.
 func (dns *Msg) SetQuestion(z string, t uint16) *Msg {
 	dns.Id = Id()
 	dns.RecursionDesired = true
@@ -33,7 +35,9 @@ func (dns *Msg) SetQuestion(z string, t uint16) *Msg {
 	return dns
 }
 
-// SetNotify creates a notify message.
+// SetNotify creates a notify message, it sets the Question
+// section, generates an Id and sets the Authoritative (AA)
+// bit to true.
 func (dns *Msg) SetNotify(z string) *Msg {
 	dns.Opcode = OpcodeNotify
 	dns.Authoritative = true