diff --git a/msg.go b/msg.go
index 2bd08257..b26f1a2e 100644
--- a/msg.go
+++ b/msg.go
@@ -286,7 +286,7 @@ End:
 // In theory, the pointers are only allowed to jump backward.
 // We let them jump anywhere and stop jumping after a while.
 
-// UnpackDomainName unpack a domain name.
+// UnpackDomainName unpacks a domain name into a string.
 func UnpackDomainName(msg []byte, off int) (s string, off1 int, ok bool) {
 	s = ""
 	lenmsg := len(msg)
@@ -1041,7 +1041,8 @@ func (h *MsgHdr) String() string {
 	return s
 }
 
-// Pack a msg: convert it to wire format.
+// Pack packs a Msg: it is converted to to wire format.
+// If the dns.Compress is true the message will be in compressed wire format.
 func (dns *Msg) Pack() (msg []byte, ok bool) {
 	var dh Header
 	compression := make(map[string]int) // Compression pointer mappings
@@ -1109,7 +1110,7 @@ func (dns *Msg) Pack() (msg []byte, ok bool) {
 	return msg[:off], true
 }
 
-// Unpack a binary message to a Msg structure.
+// Unpack unpacks a binary message to a Msg structure.
 func (dns *Msg) Unpack(msg []byte) bool {
 	// Header.
 	var dh Header
diff --git a/update.go b/update.go
index ed281594..0edeee9e 100644
--- a/update.go
+++ b/update.go
@@ -125,7 +125,7 @@ func (u *Msg) RRsetNotUsed(rr []RR) {
 //   NONE     rrset    rr       Delete an RR from RRset     RRsetDeleteRR
 //   zone     rrset    rr       Add to an RRset             RRsetAddRdata
 
-// RRsetAddRdata adds an complete RRset, see RFC 2136 section 2.5.1
+// RRsetAddRdata creates a dynamic update packet that adds an complete RRset, see RFC 2136 section 2.5.1
 func (u *Msg) RRsetAddRdata(rr []RR) {
 	if len(u.Question) == 0 {
 		panic("empty question section")
@@ -137,7 +137,7 @@ func (u *Msg) RRsetAddRdata(rr []RR) {
 	}
 }
 
-// RRsetDelete deletes an RRset, see RFC 2136 section 2.5.2
+// RRsetDelete creates a dynamic update packet that deletes an RRset, see RFC 2136 section 2.5.2
 func (u *Msg) RRsetDelete(rr []RR) {
 	u.Ns = make([]RR, len(rr))
 	for i, r := range rr {
@@ -148,7 +148,7 @@ func (u *Msg) RRsetDelete(rr []RR) {
 	}
 }
 
-// NameDelete deletes all RRsets of a name, see RFC 2136 section 2.5.3
+// NameDelete creates a dynamic update packet that deletes all RRsets of a name, see RFC 2136 section 2.5.3
 func (u *Msg) NameDelete(rr []RR) {
 	u.Ns = make([]RR, len(rr))
 	for i, r := range rr {
@@ -156,7 +156,7 @@ func (u *Msg) NameDelete(rr []RR) {
 	}
 }
 
-// RRsetDeleteRR deletes RR from the RRSset, see RFC 2136 section 2.5.4
+// RRsetDeleteRR creates a dynamic update packet deletes RR from the RRSset, see RFC 2136 section 2.5.4
 func (u *Msg) RRsetDeleteRR(rr []RR) {
 	u.Ns = make([]RR, len(rr))
 	for i, r := range rr {