diff --git a/src/xdocs/writingjavadocchecks.xml.vm b/src/xdocs/writingjavadocchecks.xml.vm
index a1b93e2e0..6599e176a 100644
--- a/src/xdocs/writingjavadocchecks.xml.vm
+++ b/src/xdocs/writingjavadocchecks.xml.vm
@@ -313,6 +313,15 @@ JAVADOC -> <audio><source src="horse.ogg" type="audio/ogg"/></audio><EOF> [0:0]
         ]]></source>
       </p>
 
+    <p>
+      Here is what you get if unknown tag doesn't have matching end tag (for example, HTML5 tag &lt;audio&gt;): <br/>
+      Input:
+      <source>&lt;audio&gt;test</source>
+      Output:
+      <source>[ERROR:0] Javadoc comment at column 1 has parse error. Missed HTML close tag 'audio'. Sometimes it means that close tag missed for one of previous tags.</source>
+      As you see Javadoc parser prints error and doesn't build AST if unknown HTML tag doesn't have matching end tag.
+    </p>
+
     <p>More examples:</p>
 
     <table style="table-layout: fixed;">