diff --git a/2. IPv6 Basic Technology/Routing.md b/2. IPv6 Basic Technology/Routing.md
index 321cd84..f425023 100644
--- a/2. IPv6 Basic Technology/Routing.md	
+++ b/2. IPv6 Basic Technology/Routing.md	
@@ -69,6 +69,7 @@ different features to be active:
 - Customer Edge (CE) routers (enterprise): These are routers that
   connect an enterprise network to one or more ISPs
   \[[RFC7084](https://www.rfc-editor.org/info/rfc7084)\],
+  {{RFC8585}},
   \[[RFC9096](https://www.rfc-editor.org/info/rfc9096)\].
 
 - Enterprise routers: Internal routers within a large enterprise