diff --git a/dns.go b/dns.go
index 556743a1..c2d7b44e 100644
--- a/dns.go
+++ b/dns.go
@@ -12,7 +12,7 @@
 //
 // The package dns supports (async) querying/replying, incoming/outgoing Axfr/Ixfr, 
 // TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing.
-// Note that domain names MUST be full qualified, before sending them.
+// Note that domain names MUST be fully qualified, before sending them.
 //
 // Resource records are native types. They are not stored in wire format.
 // Basic usage pattern for creating a new resource record:
@@ -48,7 +48,7 @@
 //
 //      m1 := new(dns.Msg)
 //      m1.MsgHdr.Id = Id()
-//      m1.MsgHdr.RecursionDesired = false
+//      m1.MsgHdr.RecursionDesired = true
 //      m1.Question = make([]Question, 1)
 //      m1.Question[0] = dns.Question{"miek.nl.", dns.TypeMX, dns.ClassINET}
 //
@@ -62,7 +62,7 @@
 // An asynchronous query is also possible, see client.Do and client.DoRtt.
 //
 // From a birds eye view a dns message consists out of four sections.
-// The question section: in.Question, the answer answer section: in.Answer,
+// The question section: in.Question, the answer section: in.Answer,
 // the authority section: in.Ns and the additional section: in.Extra.
 //
 // Each of these sections (except the Question section) contain a []RR. Basic
diff --git a/dnssec.go b/dnssec.go
index d1a0790b..23e64229 100644
--- a/dnssec.go
+++ b/dnssec.go
@@ -306,7 +306,7 @@ func (s *RR_RRSIG) Sign(k PrivateKey, rrset []RR) error {
 
 // Verify validates an RRSet with the signature and key. This is only the
 // cryptographic test, the signature validity period must be checked separately.
-// This function copies the rdata of some RRs (to lowercases domain names) for the validation to work. 
+// This function copies the rdata of some RRs (to lowercase domain names) for the validation to work. 
 func (s *RR_RRSIG) Verify(k *RR_DNSKEY, rrset []RR) error {
 	// First the easy checks
 	if len(rrset) == 0 {
diff --git a/tsig.go b/tsig.go
index 8d11e6e0..be63ac5a 100644
--- a/tsig.go
+++ b/tsig.go
@@ -72,7 +72,6 @@ const (
 	HmacSHA256 = "hmac-sha256."
 )
 
-// RFC 2845.
 type RR_TSIG struct {
 	Hdr        RR_Header
 	Algorithm  string `dns:"domain-name"`
diff --git a/zone.go b/zone.go
index 0e5ac965..b78e9b57 100644
--- a/zone.go
+++ b/zone.go
@@ -51,7 +51,8 @@ func NewZone(origin string) *Zone {
 	return z
 }
 
-// Insert inserts an RR into the zone. Duplicate data overwrites the old data.
+// Insert inserts an RR into the zone. Duplicate data overwrites the old data without
+// warning.
 func (z *Zone) Insert(r RR) error {
 	if !IsSubDomain(z.Origin, r.Header().Name) {
 		return &Error{Err: "out of zone data", Name: r.Header().Name}