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# 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.
The Update Config AppConfig pane
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.
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