diff --git a/edns.go b/edns.go
index b8fefba8..6f9d2ea3 100644
--- a/edns.go
+++ b/edns.go
@@ -420,6 +420,7 @@ func (e *EDNS0_LLQ) String() string {
 	return s
 }
 
+// EDNS0_DUA implements the EDNS0 "DNSSEC Algorithm Understood" option. See RFC 6975.
 type EDNS0_DAU struct {
 	Code    uint16 // Always EDNS0DAU
 	AlgCode []uint8
@@ -442,6 +443,7 @@ func (e *EDNS0_DAU) String() string {
 	return s
 }
 
+// EDNS0_DHU implements the EDNS0 "DS Hash Understood" option. See RFC 6975.
 type EDNS0_DHU struct {
 	Code    uint16 // Always EDNS0DHU
 	AlgCode []uint8
@@ -464,6 +466,7 @@ func (e *EDNS0_DHU) String() string {
 	return s
 }
 
+// EDNS0_N3U implements the EDNS0 "NSEC3 Hash Understood" option. See RFC 6975.
 type EDNS0_N3U struct {
 	Code    uint16 // Always EDNS0N3U
 	AlgCode []uint8
@@ -487,6 +490,7 @@ func (e *EDNS0_N3U) String() string {
 	return s
 }
 
+// EDNS0_EXPIRE implementes the EDNS0 option as described in RFC 7314.
 type EDNS0_EXPIRE struct {
 	Code   uint16 // Always EDNS0EXPIRE
 	Expire uint32
diff --git a/sanitize.go b/sanitize.go
index b489f3f0..c415bdd6 100644
--- a/sanitize.go
+++ b/sanitize.go
@@ -3,7 +3,7 @@ package dns
 // Dedup removes identical RRs from rrs. It preserves the original ordering.
 // The lowest TTL of any duplicates is used in the remaining one. Dedup modifies
 // rrs.
-// m is used to store the RRs temporay. If it is nil a new map will be allocated.
+// m is used to store the RRs temporary. If it is nil a new map will be allocated.
 func Dedup(rrs []RR, m map[string]RR) []RR {
 	if m == nil {
 		m = make(map[string]RR)
diff --git a/scan_rr.go b/scan_rr.go
index 26af0f0c..f4ccc842 100644
--- a/scan_rr.go
+++ b/scan_rr.go
@@ -2095,7 +2095,7 @@ func setTKEY(h RR_Header, c chan lex, o, f string) (RR, *ParseError, string) {
 		return nil, &ParseError{f, "bad TKEY algorithm", l}, ""
 	}
 	rr.Algorithm = l.token
-	<-c     // zBlank
+	<-c // zBlank
 
 	// Get the key length and key values
 	l = <-c
@@ -2104,13 +2104,13 @@ func setTKEY(h RR_Header, c chan lex, o, f string) (RR, *ParseError, string) {
 		return nil, &ParseError{f, "bad TKEY key length", l}, ""
 	}
 	rr.KeySize = uint16(i)
-	<-c     // zBlank
+	<-c // zBlank
 	l = <-c
 	if l.value != zString {
 		return nil, &ParseError{f, "bad TKEY key", l}, ""
 	}
 	rr.Key = l.token
-	<-c     // zBlank
+	<-c // zBlank
 
 	// Get the otherdata length and string data
 	l = <-c
@@ -2119,7 +2119,7 @@ func setTKEY(h RR_Header, c chan lex, o, f string) (RR, *ParseError, string) {
 		return nil, &ParseError{f, "bad TKEY otherdata length", l}, ""
 	}
 	rr.OtherLen = uint16(i)
-	<-c     // zBlank
+	<-c // zBlank
 	l = <-c
 	if l.value != zString {
 		return nil, &ParseError{f, "bad TKEY otherday", l}, ""
diff --git a/xfr_test.go b/xfr_test.go
index e7cc6b2f..831eba93 100644
--- a/xfr_test.go
+++ b/xfr_test.go
@@ -38,9 +38,6 @@ func TestAXFR_Miek(t *testing.T) {
 				t.Errorf("error %v", ex.Error)
 				break
 			}
-			for _, rr := range ex.RR {
-				// Nothing
-			}
 		}
 	}
 }
@@ -89,9 +86,6 @@ func TestAXFR_Miek_Tsig(t *testing.T) {
 				t.Errorf("error %v", ex.Error)
 				break
 			}
-			for _, rr := range ex.RR {
-				// Nothing
-			}
 		}
 	}
 }