diff --git a/en_US/howto/change.mailbox.format.md b/en_US/howto/change.mailbox.format.md
index 1d31bc6d..6648cea5 100644
--- a/en_US/howto/change.mailbox.format.md
+++ b/en_US/howto/change.mailbox.format.md
@@ -1,4 +1,4 @@
-# Change mailbox format (e.g. maildir, mdbox)
+# Change per-user mailbox format (e.g. maildir, mdbox)
 
 iRedMail uses `maildir` mailbox format by default, it's easy to migrate and
 maintain, but if mailbox size is growing, the performance will be getting
diff --git a/html/change.mailbox.format.html b/html/change.mailbox.format.html
index d85171d1..b588fac1 100644
--- a/html/change.mailbox.format.html
+++ b/html/change.mailbox.format.html
@@ -2,7 +2,7 @@
 <html>
     <head>
         <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-        <title>Change mailbox format (e.g. maildir, mdbox)</title>
+        <title>Change per-user mailbox format (e.g. maildir, mdbox)</title>
         <link rel="stylesheet" type="text/css" href="./css/markdown.css" />
     </head>
     <body>
@@ -15,7 +15,7 @@
              />&nbsp;
         <span>iRedMail</span>
     </a>
-    &nbsp;&nbsp;//&nbsp;&nbsp;<a href="./index.html">Document Index</a></div><h1 id="change-mailbox-format-eg-maildir-mdbox">Change mailbox format (e.g. maildir, mdbox)</h1>
+    &nbsp;&nbsp;//&nbsp;&nbsp;<a href="./index.html">Document Index</a></div><h1 id="change-per-user-mailbox-format-eg-maildir-mdbox">Change per-user mailbox format (e.g. maildir, mdbox)</h1>
 <p>iRedMail uses <code>maildir</code> mailbox format by default, it's easy to migrate and
 maintain, but if mailbox size is growing, the performance will be getting
 slower due to too much disk I/O. Dovecot's own mailbox format <code>mdbox</code> has very
diff --git a/html/index.html b/html/index.html
index 6edb6ad5..d9751891 100644
--- a/html/index.html
+++ b/html/index.html
@@ -112,7 +112,7 @@
 <li><a href="amavisd.per-recipient.policy.lookup.html">Amavisd: Enable per-recipient policy lookup</a></li>
 <li><a href="authenticate.without.domain.name.html">Authenticate without domain part in email address</a></li>
 <li><a href="backupmx.html">How to mark a mail domain as backup MX</a></li>
-<li><a href="change.mailbox.format.html">Change mailbox format (e.g. maildir, mdbox)</a></li>
+<li><a href="change.mailbox.format.html">Change per-user mailbox format (e.g. maildir, mdbox)</a></li>
 <li><a href="change.server.hostname.html">Change server hostname</a></li>
 <li><a href="concurrent.processing.html">Process more emails concurrently</a></li>
 <li><a href="dovecot.master.user.html">Dovecot Master User: Access user's mailbox without owner's password.</a></li>
