diff --git a/Complaining.html.md b/Complaining.html.md
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@@ -3,6 +3,6 @@ Complaiments
 
 My complainings on this website are linked on this page.
 
-Top posting on mailing lists. — Coming soon
+[Top posting on mailing lists.](http://mkaysi.github.com/top-posting.html)
 
 HTML on mailing lists. — Coming soon
diff --git a/topposting.html b/topposting.html
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+<h1>Top-posting</h1>
+
+<h2>What is top-posting?</h2>
+
+<p>Top posting is replying before the text which you are replying to (and which is usually automatically quoted by your email client).</p>
+
+<p>This example from <a href="https://wiki.debian.org/FAQsFromDebianUser#What_is_top-posting_.28and_why_shouldn.27t_I_do_it.29.3F">Debian wiki</a> answers to both, this and next question.</p>
+
+<pre><code>A: Because it messes up the way you read
+Q: Why is top-posting bad?
+A: Writing your answer before the question
+Q: What is top-posting?
+</code></pre>
+
+<h2>Why is it bad?</h2>
+
+<p>See the answer to the previous question. It explains everything.</p>
+
+<h2>Rules</h2>
+
+<p>At least <a href="http://www.debian.org/MailingLists/#codeofconduct">Debian mailing lists</a> and <a href="http://www.ubuntu.com/support/community/mailinglists">Ubuntu mailing lists</a> forbid top-posting in their guidelines. In my opinion other mailing lists should do this too.</p>
diff --git a/topposting.html.md b/topposting.html.md
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+Top-posting
+===========
+
+What is top-posting?
+--------------------
+
+Top posting is replying before the text which you are replying to (and which is usually automatically quoted by your email client).
+
+This example from [Debian wiki](https://wiki.debian.org/FAQsFromDebianUser#What_is_top-posting_.28and_why_shouldn.27t_I_do_it.29.3F) answers to both, this and next question.
+
+    A: Because it messes up the way you read
+    Q: Why is top-posting bad?
+    A: Writing your answer before the question
+    Q: What is top-posting?
+
+Why is it bad?
+--------------
+
+See the answer to the previous question. It explains everything.
+
+Rules
+-----
+
+At least [Debian mailing lists](http://www.debian.org/MailingLists/#codeofconduct) and [Ubuntu mailing lists](http://www.ubuntu.com/support/community/mailinglists) forbid top-posting in their guidelines. In my opinion other mailing lists should do this too.