More details on reference zones logic and conditions

Author: RebeccaTamachiro

src/content/docs/dns/internal-dns/get-started.mdx

@@ -53,7 +53,7 @@ Although there are some steps that can be achieved on the dashboard, currently t
 
 ### (Optional) Reference a zone from another zone
 
-1. Use the [Update DNS settings](/api/resources/dns/subresources/settings/methods/edit/) endpoint to add a reference from an internal zone to another internal zone. In `--data`, specify the `internal_dns` object with the parameter `reference_zone_id`.
+1. Use the [Update DNS settings](/api/resources/dns/subresources/settings/methods/edit/) endpoint to add a reference from an internal zone to another internal zone. In `--data`, specify the `internal_dns` object with the parameter `reference_zone_id`. For details, refer to [Manage internal zones](/dns/internal-dns/internal-zones/#reference-zones).
 
 <Example>
 <Render file="internal-reference-zone-api"/>

src/content/docs/dns/internal-dns/internal-zones.mdx

@@ -28,14 +28,27 @@ When setting up internal zones, observe the following conditions:
 
 Since the resolver policy configuration will require a view, you must link the internal zones to at least one view to be able to use them when routing requests to Internal DNS. For a full procedure overview, refer to [get started](/dns/internal-dns/get-started/).
 
-## Configure a reference zone
+## Reference zones
+
+### How it works
 
 During an [internal DNS query resolution](/dns/internal-dns/#architecture-overview), if no internal record is found within a matching internal zone, Cloudflare will check if the matching internal zone is referencing another internal zone.
 
-To configure a reference zone to be used in such cases, use the [Update DNS settings](/api/resources/dns/subresources/settings/methods/edit/) endpoint. In `--data`, specify the `internal_dns` object with the parameter `reference_zone_id`.
+Successive references can be followed with a maximum of five references in a chain.
+
+### Setup
+
+To set up a reference zone, use the [Update DNS settings](/api/resources/dns/subresources/settings/methods/edit/) endpoint. In `--data`, specify the `internal_dns` object with the parameter `reference_zone_id`.
+
+Each internal zone can only reference one other zone, but the same zone can be referenced by multiple internal zones.
+
+Public zones cannot be used as reference zones.
 
 <Example>
 <Render file="internal-reference-zone-api"/>
+
+A third zone (C) could also point to zone B as a reference, but zone A cannot add another zone as a reference while also having zone B configured as its reference zone.
+
 </ Example>
 
 ## Other actions