Update CHANGELOG/release-notes.

CHANGELOG

@@ -28,9 +28,9 @@ version 2.69
 	    
 	    make dnsmasq COPTS='-DHAVE_DNSSEC -DHAVE_DNSSEC_STATIC'
 	    
-	    which bloats the dnsmasq binary to over a megabyte, but
-	    saves the size of the shared libraries which are five
-	    times that size.
+	    which bloats the dnsmasq binary, but saves the size of 
+	    the shared libraries which are much bigger.
+
 	    To enable, DNSSEC, you will need a set of
 	    trust-anchors. Now that the TLDs are signed, this can be
 	    the keys for the root zone, and for convenience they are
@@ -56,6 +56,36 @@ version 2.69
 	    downstream validators. Setting --log-queries will show 
 	    DNSSEC in action.
 
+	    If a domain is returned from an upstream nameserver without 
+	    DNSSEC signature, dnsmasq by default trusts this. This 
+	    means that for unsigned zone (still the majority) there 
+	    is effectively no cost for having DNSSEC enabled. Of course
+	    this allows an attacker to replace a signed record with a 
+	    false unsigned record. This is addressed by the 
+	    --dnssec-check-unsigned flag, which instructs dnsmasq
+	    to prove that an unsigned record is legitimate, by finding  
+	    a secure proof that the zone containing the record is not
+	    signed. Doing this has costs (typically one or two extra
+	    upstream queries). It also has a nasty failure mode if
+	    dnsmasq's upstream nameservers are not DNSSEC capable. 
+	    Without --dnssec-check-unsigned using such an upstream
+	    server will simply result in not queries being validated; 
+	    with --dnssec-check-unsigned enabled and a 
+	    DNSSEC-ignorant upstream server, _all_ queries will fail.
+
+	    Note that DNSSEC requires that the local time is valid and 
+	    accurate, if not then DNSSEC validation will fail. NTP 
+	    should be running. This presents a problem for routers
+	    without a battery-backed clock. To set the time needs NTP 
+	    to do DNS lookups, but lookups will fail until NTP has run.
+	    To address this, there's a flag, --dnssec-no-timecheck 
+	    which disables the time checks (only) in DNSSEC. When dnsmasq
+	    is started and the clock is not synced, this flag should
+	    be used. As soon as the clock is synced, SIGHUP dnsmasq. 
+	    The SIGHUP clears the cache of partially-validated data and
+	    resets the no-timecheck flag, so that all DNSSEC checks 
+	    henceforward will be complete.
+	    
 	    The development of DNSSEC in dnsmasq was started by 
 	    Giovanni Bajo, to whom huge thanks are owed. It has been
 	    supported by Comcast, whose techfund grant has allowed for 
@@ -84,6 +114,9 @@ version 2.69
 	    correct answer was included, but the RCODE was set to NXDOMAIN.
 	    Thanks to Craig McQueen for spotting this.
 
+	    Make statistics available as DNS queries in the .bind TLD as 
+	    well as logging them.
+
 
 version 2.68
             Use random addresses for DHCPv6 temporary address