diff --git a/anchor.go b/anchor.go
index 72d4a4f3..d23ae8a6 100644
--- a/anchor.go
+++ b/anchor.go
@@ -108,7 +108,7 @@ var (
 </KeyDigest>
 </TrustAnchor>`
 	// This is the root zone used for priming a resolver.
-	NamedRoot = `;       This file holds the information on root name servers needed to
+	namedRoot = `;       This file holds the information on root name servers needed to
 ;       initialize cache of Internet domain name servers
 ;       (e.g. reference this file in the "cache  .  <file>"
 ;       configuration file of BIND domain name servers).
diff --git a/edns.go b/edns.go
index 159fd7ef..e6470d2f 100644
--- a/edns.go
+++ b/edns.go
@@ -1,17 +1,7 @@
 // EDNS0
 //
 // EDNS0 is an extension mechanism for the DNS defined in RFC 2671. It defines a 
-// standard RR type, the OPT RR, which is then completely abused. The normal RR header is
-// redefined as:
-//
-//  	Name          string "domain-name"  // should always be "."
-//  	Opt           uint16		    // was type, but is always TypeOPT
-//  	UDPSize       uint16		    // was class
-//  	ExtendedRcode uint8		    // was TTL
-//  	Version       uint8		    // was TTL
-//  	Z             uint16		    // was TTL (all flags should be put here)
-//  	Rdlength      uint16		    // not changed
-// 
+// standard RR type, the OPT RR, which is then completely abused. 
 // Basic use pattern for creating an (empty) OPT RR:
 //
 //	o := new(dns.RR_OPT)
diff --git a/nsecx.go b/nsecx.go
index 7df9565a..314fdc7e 100644
--- a/nsecx.go
+++ b/nsecx.go
@@ -9,8 +9,8 @@ import (
 
 const (
 	_ = iota
-	NSEC3_NXDOMAIN
-	NSEC3_NODATA
+	_NSEC3_NXDOMAIN
+	_NSEC3_NODATA
 )
 
 // A Denialer is a record that performs denial
@@ -226,7 +226,7 @@ func (m *Msg) Nsec3Verify(q Question) (int, error) {
 			return 0, ErrDenialHdr
 		}
 
-		return NSEC3_NXDOMAIN, nil
+		return _NSEC3_NXDOMAIN, nil
 	}
 	return 0, nil
 NoData:
@@ -258,5 +258,5 @@ NoData:
 	if m.MsgHdr.Rcode == RcodeNameError {
 		return 0, ErrDenialHdr
 	}
-	return NSEC3_NODATA, nil
+	return _NSEC3_NODATA, nil
 }
diff --git a/tsig.go b/tsig.go
index 96c060bf..74e7a080 100644
--- a/tsig.go
+++ b/tsig.go
@@ -1,7 +1,7 @@
 // TRANSACTION SIGNATURE (TSIG)
 // 
 // An TSIG or transaction signature adds a HMAC TSIG record to each message sent. 
-// The supported algorithm include: HmacMD5, HmacSHA1 and HmacSHA256.
+// The supported algorithms include: HmacMD5, HmacSHA1 and HmacSHA256.
 //
 // Basic use pattern when querying with a TSIG name "axfr." (note that these key names
 // must be fully qualified) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==":
diff --git a/update.go b/update.go
index 93de460a..0fb549f6 100644
--- a/update.go
+++ b/update.go
@@ -35,18 +35,6 @@
 // 
 package dns
 
-// The table from RFC 2136 supplemented with the Go DNS function.
-//
-// 3.2.4 - Table Of Metavalues Used In Prerequisite Section
-//
-//   CLASS    TYPE     RDATA    Meaning                     Function
-//   ---------------------------------------------------------------
-//   ANY      ANY      empty    Name is in use              NameUsed
-//   ANY      rrset    empty    RRset exists (value indep)  RRsetUsedNoRdata
-//   NONE     ANY      empty    Name is not in use          NameNotUsed
-//   NONE     rrset    empty    RRset does not exist        RRsetNotUsed
-//   zone     rrset    rr       RRset exists (value dep)    RRsetUsedRdata
-
 // NameUsed sets the RRs in the prereq section to
 // "Name is in use" RRs. RFC 2136 section 2.4.4.
 func (u *Msg) NameUsed(rr []RR) {