diff --git a/en_US/howto/1-change.mail.attachment.size.md b/en_US/howto/1-change.mail.attachment.size.md
index 865234ae..421da7b4 100644
--- a/en_US/howto/1-change.mail.attachment.size.md
+++ b/en_US/howto/1-change.mail.attachment.size.md
@@ -97,6 +97,11 @@ upload_max_filesize = 100M;
 post_max_size = 100M;
 ```
 
+Note:
+
+* If you're running Nginx as web server, restarting php-fpm service is required.
+* If you're running Apache as web server, restarting Apache service is required.
+
 ## Roundcube webmail
 
 Roundcube uses its own setting `max_message_size` to limit message size, please
diff --git a/html/change.mail.attachment.size.html b/html/change.mail.attachment.size.html
index b136a742..ebe13240 100644
--- a/html/change.mail.attachment.size.html
+++ b/html/change.mail.attachment.size.html
@@ -124,6 +124,11 @@ upload_max_filesize = 100M;
 post_max_size = 100M;
 </code></pre>
 
+<p>Note:</p>
+<ul>
+<li>If you're running Nginx as web server, restarting php-fpm service is required.</li>
+<li>If you're running Apache as web server, restarting Apache service is required.</li>
+</ul>
 <h2 id="roundcube-webmail">Roundcube webmail</h2>
 <p>Roundcube uses its own setting <code>max_message_size</code> to limit message size, please
 add or update this parameter in its config file:</p>