diff --git a/en_US/migrations/1-migrate.to.new.iredmail.server.md b/en_US/migrations/1-migrate.to.new.iredmail.server.md
index 7ada6499..e2e96cb9 100644
--- a/en_US/migrations/1-migrate.to.new.iredmail.server.md
+++ b/en_US/migrations/1-migrate.to.new.iredmail.server.md
@@ -112,11 +112,18 @@ structure related changes. Check [upgrade tutorials for iRedMail](./iredmail.rel
 ## Migrate mailboxes (Maildir format)
 
 * Copy all mailboxes (in Maildir format) to new iRedMail server with tools like `rsync`.
-* Set correct file owner of mailboxes. Default owner is `vmail`, group is `vmail`.
-* Set correct file permission of mailboxes. Default is `0700`.
+* Set correct file owner and permission of mailboxes. Default owner is `vmail`,
+  group is `vmail`, permission is `0700`.
+
+> WARNING:
+>
+> * please make sure maildir path stored in SQL/LDAP matches the mailbox
+>   path on file system, so that mail clients can find imported emails.
+>
+> * After migrated mailboxes, you may want to recalculate mailbox quota by
+>   following our tutorial:
+>   [Force Dovecot to recalculate mailbox quota](./recalculate.mailbox.quota.html)
 
-WARNING: please make sure maildir path stored in SQL/LDAP matches the mailbox
-path on file system, so that mail clients can find imported emails.
 
 * With SQL backends, you can get full maildir path of user with below SQL command:
 
diff --git a/html/css/markdown.css b/html/css/markdown.css
index 19df47a5..5caeacae 100644
--- a/html/css/markdown.css
+++ b/html/css/markdown.css
@@ -308,3 +308,4 @@ th { font-style: bold; text-align: left; }
 /*
 code.bash { background-color: green; color: white; }
 */
+pre { margin-left: 30px; }
diff --git a/html/migrate.to.new.iredmail.server.html b/html/migrate.to.new.iredmail.server.html
index 012bd60b..81a21882 100644
--- a/html/migrate.to.new.iredmail.server.html
+++ b/html/migrate.to.new.iredmail.server.html
@@ -128,11 +128,23 @@ structure related changes. Check <a href="./iredmail.releases.html">upgrade tuto
 <h2 id="migrate-mailboxes-maildir-format">Migrate mailboxes (Maildir format)</h2>
 <ul>
 <li>Copy all mailboxes (in Maildir format) to new iRedMail server with tools like <code>rsync</code>.</li>
-<li>Set correct file owner of mailboxes. Default owner is <code>vmail</code>, group is <code>vmail</code>.</li>
-<li>Set correct file permission of mailboxes. Default is <code>0700</code>.</li>
+<li>Set correct file owner and permission of mailboxes. Default owner is <code>vmail</code>,
+  group is <code>vmail</code>, permission is <code>0700</code>.</li>
 </ul>
-<p>WARNING: please make sure maildir path stored in SQL/LDAP matches the mailbox
-path on file system, so that mail clients can find imported emails.</p>
+<blockquote>
+<p>WARNING:</p>
+<ul>
+<li>
+<p>please make sure maildir path stored in SQL/LDAP matches the mailbox
+  path on file system, so that mail clients can find imported emails.</p>
+</li>
+<li>
+<p>After migrated mailboxes, you may want to recalculate mailbox quota by
+  following our tutorial:
+  <a href="./recalculate.mailbox.quota.html">Force Dovecot to recalculate mailbox quota</a></p>
+</li>
+</ul>
+</blockquote>
 <ul>
 <li>With SQL backends, you can get full maildir path of user with below SQL command:</li>
 </ul>