Update self-hosted-private-app.mdx

Author: kennyj42

src/content/docs/cloudflare-one/applications/non-http/self-hosted-private-app.mdx

@@ -37,7 +37,7 @@ This feature is available in early access and replaces the legacy [private netwo
 6. Add the private IP and/or private hostname that represents the application.
 
 	:::note
-	Private hostnames are currently only available over port `443` over HTTPS.
+	Private hostnames are currently only available over port `443` over HTTPS and the application must have a valid Server Name Indicator (SNI).
 	:::
 
 7. Add [Access policies](/cloudflare-one/policies/access/) to control who can connect to your application. All Access applications are deny by default -- a user must match an Allow policy before they are granted access.