diff --git a/TODO.md b/TODO.md
index 5604ce77..30b82200 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,13 +1,3 @@
+* Able to convert changed markdown files instead of all with `convert.sh` on
+  command line, it will save a lot of time.
 * Add copyright in bottom of HTML files.
-* Able to convert specified markdown files with `convert.sh` on command line,
-it will save a lot of time. Sample usage:
-
-```
-# bash convert.sh 4-howto/abc.md 9-troubleshooting/def.md
-```
-
-Split main code to several small functions:
-
-1. Find all articles, or get articles from command line.
-1. Convert file names, etc.
-1. Execute tools/markdown2html.py to convert files.
diff --git a/URLs.md b/URLs.md
index ed0a4f66..34e92746 100644
--- a/URLs.md
+++ b/URLs.md
@@ -2,14 +2,15 @@
 
 # installation guides
 
-* https://code.google.com/p/iredmail/wiki/DNS_DKIM
-* https://code.google.com/p/iredmail/wiki/DNS_SPF
 * http://www.iredmail.org/install_iredmail_on_debian.html
 * http://www.iredmail.org/install_iredmail_on_ubuntu.html
 * http://www.iredmail.org/install_iredmail_on_freebsd.html
 * http://www.iredmail.org/wiki/index.php?title=Install/iRedMail/FreeBSD.Jail
 * http://www.iredmail.org/install_iredmail_on_openbsd.html
+
 * ~~ http://www.iredmail.org/install_iredmail_on_rhel.html ~~
+* ~~ https://code.google.com/p/iredmail/wiki/DNS_DKIM ~~
+* ~~ https://code.google.com/p/iredmail/wiki/DNS_SPF ~~
 
 # integrations
 
diff --git a/html/setup_dns.html b/html/setup_dns.html
index b3aa902d..3fbf05bf 100644
--- a/html/setup_dns.html
+++ b/html/setup_dns.html
@@ -86,9 +86,11 @@ need to switch your IPs quickly.</p>
 <pre><code>NAME                TTL     TYPE    DATA
 
 www.mydomain.com.   1800    A       192.168.1.2
+mail.mydomain.com.  1800    A       192.168.1.5
 </code></pre>
 
-<p>The end result of this record is that <code>www.mydomain.com.</code> points to <code>192.168.1.2</code>.</p>
+<p>The end result of this record is that <code>www.mydomain.com</code> points to
+<code>192.168.1.2</code>, and <code>mail.mydomain.com</code> points to <code>192.168.1.5</code>.</p>
 <h2 id="reverse-ptr-record-for-server-ip-address">Reverse PTR record for server IP address</h2>
 <h3 id="what-is-a-reverse-ptr-record">What is a reverse PTR record</h3>
 <p>PTR record or more appropriately a reverse PTR record is a process of resolving