diff --git a/howto/concurrent.processing.md b/howto/concurrent.processing.md
index b66c0fcd..6e7e31e2 100644
--- a/howto/concurrent.processing.md
+++ b/howto/concurrent.processing.md
@@ -58,4 +58,5 @@ reloading OR restarting is required if you modified `/etc/postfix/main.cf`.
 References:
 
 * [Amavisd web site](http://www.amavis.org)
+* [Tuning: Maximum Number of Concurrent Processes](http://www.ijs.si/software/amavisd/README.postfix.html#d0e1231)
 * [Integrating amavisd-new in Postfix](http://www.ijs.si/software/amavisd/README.postfix.html)
diff --git a/html/concurrent.processing.html b/html/concurrent.processing.html
index b89c991c..587b4900 100644
--- a/html/concurrent.processing.html
+++ b/html/concurrent.processing.html
@@ -58,6 +58,7 @@ reloading OR restarting is required if you modified <code>/etc/postfix/main.cf</
 <p>References:</p>
 <ul>
 <li><a href="http://www.amavis.org">Amavisd web site</a></li>
+<li><a href="http://www.ijs.si/software/amavisd/README.postfix.html#d0e1231">Tuning: Maximum Number of Concurrent Processes</a></li>
 <li><a href="http://www.ijs.si/software/amavisd/README.postfix.html">Integrating amavisd-new in Postfix</a></li>
 </ul><p style="text-align: center; color: grey;">Document published under a <a href="http://creativecommons.org/licenses/by-nd/3.0/us/" target="_blank">CC BY-ND 3.0</a> license. If you found something wrong, please do <a href="http://www.iredmail.org/contact.html">contact us</a> to fix it.<script>
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