# Restrict RDS instance size

1. From the DuploCloud Portal, navigate to **Administrator** -> **Systems Settings**.
2. Select the **System Config** tab, and click **Add**. The **Update Config AppConfig** pane displays.<br>

   <div align="left"><figure><img src="/files/3pYn4IR2tWr3ctLwyj9p" alt="" width="375"><figcaption><p>The <strong>Update Config AppConfig</strong> pane</p></figcaption></figure></div>
3. In the **Config Type** list box, select **AppConfig**.
4. From the **Key** list box, select **RDS allowed max instance size**.
5. From the **Value** list box, select the maximum instance size.
6. Click **Submit**. RDS instances will be limited to the maximum instance size configured.<br>


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