diff --git a/en_US/iredmail-easy/8-migrate.to.iredmail.easy.md b/en_US/iredmail-easy/8-migrate.to.iredmail.easy.md
index a624c606..4e00fb43 100644
--- a/en_US/iredmail-easy/8-migrate.to.iredmail.easy.md
+++ b/en_US/iredmail-easy/8-migrate.to.iredmail.easy.md
@@ -44,6 +44,19 @@ Please backup all important data before preparing the migration, including but n
     After moved to iRedMail Easy, you should place all your custom settings in files
     under `/opt/iredmail/custom/<software>/`.
 
+## MySQL backend: Remove MySQL (not MariaDB) packages
+
+!!! attention
+
+    This is not necessary if you're running MariaDB backend.
+
+iRedMail Easy installs MariaDB instead of MySQL, if you're running MySQL
+backend, you need to:
+
+- Backup all databases
+- Remove mysql packages
+- Restore backup SQL files after iRedMail Easy installation
+
 ## Create required files used by iRedMail Easy
 
 iRedMail Easy doesn't store any SQL/LDAP passwords on its deployment servers,
diff --git a/html/migrate.to.iredmail.easy.html b/html/migrate.to.iredmail.easy.html
index 9f427c07..037d22c8 100644
--- a/html/migrate.to.iredmail.easy.html
+++ b/html/migrate.to.iredmail.easy.html
@@ -22,6 +22,7 @@
 <li><a href="#summary">Summary</a></li>
 <li><a href="#requirements">Requirements</a></li>
 <li><a href="#backup-first">Backup first</a></li>
+<li><a href="#mysql-backend-remove-mysql-not-mariadb-packages">MySQL backend: Remove MySQL (not MariaDB) packages</a></li>
 <li><a href="#create-required-files-used-by-iredmail-easy">Create required files used by iRedMail Easy</a></li>
 <li><a href="#copy-files-to-new-locations">Copy files to new locations</a></li>
 <li><a href="#split-custom-settings">Split custom settings</a><ul>
@@ -80,6 +81,18 @@ iRedMail Team quickly.</p>
 under <code>/opt/iredmail/custom/&lt;software&gt;/</code>.</p>
 </li>
 </ul>
+<h2 id="mysql-backend-remove-mysql-not-mariadb-packages">MySQL backend: Remove MySQL (not MariaDB) packages</h2>
+<div class="admonition attention">
+<p class="admonition-title">Attention</p>
+<p>This is not necessary if you're running MariaDB backend.</p>
+</div>
+<p>iRedMail Easy installs MariaDB instead of MySQL, if you're running MySQL
+backend, you need to:</p>
+<ul>
+<li>Backup all databases</li>
+<li>Remove mysql packages</li>
+<li>Restore backup SQL files after iRedMail Easy installation</li>
+</ul>
 <h2 id="create-required-files-used-by-iredmail-easy">Create required files used by iRedMail Easy</h2>
 <p>iRedMail Easy doesn't store any SQL/LDAP passwords on its deployment servers,
 instead it reads from files under <code>/root/.iredmail/kv/</code> on your server to get