diff --git a/USAGE.md b/USAGE.md
index be8842f7..2c0e3656 100644
--- a/USAGE.md
+++ b/USAGE.md
@@ -60,3 +60,8 @@ To recompile all files, append flag `--all`:
 ```bash
 $ bash convert.sh --all
 ```
+
+## Required Python modules
+
+* markdown
+* markdown_checklist
diff --git a/html/relayhost.html b/html/relayhost.html
index 51d1de21..f9cba918 100644
--- a/html/relayhost.html
+++ b/html/relayhost.html
@@ -67,11 +67,9 @@ service postfix restart
 </code></pre>
 
 <h2 id="sender-dependent-relay-host">Sender dependent relay host</h2>
-<div class="admonition note">
-<p class="admonition-title">Note</p>
-<ul>
-<li>Sender dependent relay host is available in iRedMail-0.9.5 or later releases.</li>
-</ul>
+<div class="admonition attention">
+<p class="admonition-title">Attention</p>
+<p>Sender dependent relay host is available in iRedMail-0.9.5 or later releases.</p>
 </div>
 <h3 id="manage-with-iredadmin-pro">Manage with iRedAdmin-Pro</h3>
 <p>Since iRedAdmin-Pro-SQL-2.4.0 or iRedAdmin-Pro-LDAp-2.6.0, it's able to manage