diff --git a/content/en/docs/concepts/extend-kubernetes/api-extension/apiserver-aggregation.md b/content/en/docs/concepts/extend-kubernetes/api-extension/apiserver-aggregation.md
index f9ab8647e3..f6bb478d73 100644
--- a/content/en/docs/concepts/extend-kubernetes/api-extension/apiserver-aggregation.md
+++ b/content/en/docs/concepts/extend-kubernetes/api-extension/apiserver-aggregation.md
@@ -11,7 +11,7 @@ weight: 20
 <!-- overview -->
 
 The aggregation layer allows Kubernetes to be extended with additional APIs, beyond what is offered by the core Kubernetes APIs.
-The additional APIs can either be ready-made solutions such as [service-catalog](/docs/concepts/extend-kubernetes/service-catalog/), or APIs that you develop yourself.
+The additional APIs can either be ready-made solutions such as a [metrics server](https://github.com/kubernetes-sigs/metrics-server), or APIs that you develop yourself.
 
 The aggregation layer is different from [Custom Resources](/docs/concepts/extend-kubernetes/api-extension/custom-resources/), which are a way to make the {{< glossary_tooltip term_id="kube-apiserver" text="kube-apiserver" >}} recognise new kinds of object.
 
diff --git a/content/en/docs/concepts/extend-kubernetes/service-catalog.md b/content/en/docs/concepts/extend-kubernetes/service-catalog.md
index af0271d9ab..26517de9c6 100644
--- a/content/en/docs/concepts/extend-kubernetes/service-catalog.md
+++ b/content/en/docs/concepts/extend-kubernetes/service-catalog.md
@@ -32,7 +32,7 @@ The application can access the message queue as a service.
 
 Service Catalog uses the [Open service broker API](https://github.com/openservicebrokerapi/servicebroker) to communicate with service brokers, acting as an intermediary for the Kubernetes API Server to negotiate the initial provisioning and retrieve the credentials necessary for the application to use a managed service.
 
-It is implemented as an extension API server and a controller, using etcd for storage. It also uses the [aggregation layer](/docs/concepts/extend-kubernetes/api-extension/apiserver-aggregation/) available in Kubernetes 1.7+ to present its API.
+It is implemented using a [CRDs-based](/docs/concepts/extend-kubernetes/api-extension/custom-resources/#custom-resources) architecture.
 
 <br>