Update enable-universal-ssl.mdx

Author: ngayerie

src/content/docs/ssl/edge-certificates/universal-ssl/enable-universal-ssl.mdx

@@ -54,4 +54,6 @@ Once you enable Universal SSL, you can review the [activation status](/ssl/refer
 
 <Render file="universal-ssl-validity" />
 
-If you are on a [partial setup](/ssl/edge-certificates/universal-ssl/enable-universal-ssl/#partial-dns-setup), make sure [Domain control validation (DCV)](/ssl/edge-certificates/changing-dcv-method/) is configured correctly. Refer to [Troubleshooting DCV](/ssl/edge-certificates/changing-dcv-method/troubleshooting/) for further help.
+If you are on a [partial setup](/ssl/edge-certificates/universal-ssl/enable-universal-ssl/#partial-dns-setup), make sure [Domain control validation (DCV)](/ssl/edge-certificates/changing-dcv-method/) is configured correctly. Refer to [Troubleshooting DCV](/ssl/edge-certificates/changing-dcv-method/troubleshooting/) for further help.
+
+If a valid replacement - covering some or all of the SANs in the expiring certificate - is already available, Cloudflare will remove the expiring Universal certificate in the 24 hours before expiration. There is no expected downtime due to certificate transition.