diff --git a/en_US/howto/force.user.to.change.password.md b/en_US/howto/force.user.to.change.password.md
index 2dee2299..db9f7d8f 100644
--- a/en_US/howto/force.user.to.change.password.md
+++ b/en_US/howto/force.user.to.change.password.md
@@ -1,5 +1,7 @@
 # Force mail user to change password in 90 days
 
+[TOC]
+
 ## How it works
 
 iRedMail configures Roundcube webmail to store last password change date while
@@ -46,3 +48,11 @@ CHANGE_PASSWORD_MESSAGE = 'Please change your password in webmail before sending
 ```
 
 Then restart iRedAPD service.
+
+## Roundcube plugin: `force_password_change`
+
+There's a third-party Roundcube plugin can force user to change password.
+<https://bitbucket.org/wainlake/force_password_change>
+
+Roundcube will __ALWAYS__ redirect user to `Password` page (offered by official
+Roundcube plugin password) until user changed the password.
diff --git a/html/force.user.to.change.password.html b/html/force.user.to.change.password.html
index 179554d0..3ba94a53 100644
--- a/html/force.user.to.change.password.html
+++ b/html/force.user.to.change.password.html
@@ -16,6 +16,16 @@
         <span>iRedMail</span>
     </a>
     &nbsp;&nbsp;//&nbsp;&nbsp;<a href="./index.html">Document Index</a></div><h1 id="force-mail-user-to-change-password-in-90-days">Force mail user to change password in 90 days</h1>
+<div class="toc">
+<ul>
+<li><a href="#force-mail-user-to-change-password-in-90-days">Force mail user to change password in 90 days</a><ul>
+<li><a href="#how-it-works">How it works</a></li>
+<li><a href="#how-to-enable-iredapd-plugin">How to enable iRedAPD plugin</a></li>
+<li><a href="#roundcube-plugin-force_password_change">Roundcube plugin: force_password_change</a></li>
+</ul>
+</li>
+</ul>
+</div>
 <h2 id="how-it-works">How it works</h2>
 <p>iRedMail configures Roundcube webmail to store last password change date while
 user changed password. For MySQL/MariaDB/PostgreSQL backends, it's stored in
@@ -53,7 +63,12 @@ CHANGE_PASSWORD_DAYS = 90
 CHANGE_PASSWORD_MESSAGE = 'Please change your password in webmail before sending email: https://xxx/webmail/'
 </code></pre>
 
-<p>Then restart iRedAPD service.</p><div class="footer">
+<p>Then restart iRedAPD service.</p>
+<h2 id="roundcube-plugin-force_password_change">Roundcube plugin: <code>force_password_change</code></h2>
+<p>There's a third-party Roundcube plugin can force user to change password.
+<a href="https://bitbucket.org/wainlake/force_password_change">https://bitbucket.org/wainlake/force_password_change</a></p>
+<p>Roundcube will <strong>ALWAYS</strong> redirect user to <code>Password</code> page (offered by official
+Roundcube plugin password) until user changed the password.</p><div class="footer">
     <p style="text-align: center; color: grey;">All documents are available in <a href="https://bitbucket.org/zhb/iredmail-docs/src">BitBucket repository</a>, and published under <a href="http://creativecommons.org/licenses/by-nd/3.0/us/" target="_blank">Creative Commons</a> license. You can <a href="https://bitbucket.org/zhb/iredmail-docs/get/tip.tar.bz2">download the latest version</a> for offline reading. If you found something wrong, please do <a href="http://www.iredmail.org/contact.html">contact us</a> to fix it.</p>
 </div>
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