diff --git a/en_US/howto/public.folder.md b/en_US/howto/public.folder.md
index 160b33c3..c725e552 100644
--- a/en_US/howto/public.folder.md
+++ b/en_US/howto/public.folder.md
@@ -194,6 +194,20 @@ permissions:
 echo 'anyone lr' >> /var/vmail/public/.TestFolder/dovecot-acl
 ```
 
+## Troubleshooting
+
+* If public folder doesn't work as expected, please [turn on debug mode in
+  Dovecot](./debug.dovecot.html) to get debug message. If you don't understand
+  the debug message, you can post them to our [online support forum](../forum/)
+  to get help.
+
+* It's also a good idea to run `doveadm` command with `-D` flag to turn on
+  verbose logging, like below:
+
+```
+doveadm -D acl ...
+```
+
 ## References
 
 * Dovecot official documents:
diff --git a/en_US/mua/_summary.md b/en_US/mua/_summary.md
index 326f68ed..89da979c 100644
--- a/en_US/mua/_summary.md
+++ b/en_US/mua/_summary.md
@@ -3,3 +3,4 @@
     * POP3 service: port 110 over TLS (recommended), or port 995 with SSL.
     * IMAP service: port 143 over TLS (recommended), or port 993 with SSL.
     * SMTP service: port 587 over TLS.
+    * CalDAV and CardDAV server addresses: `https://<server>/SOGo/dav/<full email address>`
diff --git a/html/index.html b/html/index.html
index 3115b8aa..bcd49e92 100644
--- a/html/index.html
+++ b/html/index.html
@@ -49,6 +49,7 @@
 <li>POP3 service: port 110 over TLS (recommended), or port 995 with SSL.</li>
 <li>IMAP service: port 143 over TLS (recommended), or port 993 with SSL.</li>
 <li>SMTP service: port 587 over TLS.</li>
+<li>CalDAV and CardDAV server addresses: <code>https://&lt;server&gt;/SOGo/dav/&lt;full email address&gt;</code></li>
 </ul>
 </div>
 <ul>
diff --git a/html/public.folder.html b/html/public.folder.html
index 0039f057..0fe29942 100644
--- a/html/public.folder.html
+++ b/html/public.folder.html
@@ -15,6 +15,7 @@
 <li><a href="#enable-public-folder-in-dovecot">Enable public folder in Dovecot</a></li>
 <li><a href="#manage-access-control-with-doveadm">Manage Access Control with doveadm</a></li>
 <li><a href="#manage-access-control-manually">Manage Access Control manually</a></li>
+<li><a href="#troubleshooting">Troubleshooting</a></li>
 <li><a href="#references">References</a></li>
 <li><a href="#see-also">See Also</a></li>
 </ul>
@@ -183,6 +184,22 @@ permissions:</p>
 <pre><code>echo 'anyone lr' &gt;&gt; /var/vmail/public/.TestFolder/dovecot-acl
 </code></pre>
 
+<h2 id="troubleshooting">Troubleshooting</h2>
+<ul>
+<li>
+<p>If public folder doesn't work as expected, please <a href="./debug.dovecot.html">turn on debug mode in
+  Dovecot</a> to get debug message. If you don't understand
+  the debug message, you can post them to our <a href="../forum/">online support forum</a>
+  to get help.</p>
+</li>
+<li>
+<p>It's also a good idea to run <code>doveadm</code> command with <code>-D</code> flag to turn on
+  verbose logging, like below:</p>
+</li>
+</ul>
+<pre><code>doveadm -D acl ...
+</code></pre>
+
 <h2 id="references">References</h2>
 <ul>
 <li>