diff --git a/pkg/apis/clientauthentication/types.go b/pkg/apis/clientauthentication/types.go
index d99ca818..bdae85b1 100644
--- a/pkg/apis/clientauthentication/types.go
+++ b/pkg/apis/clientauthentication/types.go
@@ -115,7 +115,8 @@ type Cluster struct {
 	// Config holds additional config data that is specific to the exec
 	// plugin with regards to the cluster being authenticated to.
 	//
-	// This data is sourced from the clientcmd Cluster object's extensions[exec] field:
+	// This data is sourced from the clientcmd Cluster object's
+	// extensions[client.authentication.k8s.io/exec] field:
 	//
 	// clusters:
 	// - name: my-cluster
diff --git a/pkg/apis/clientauthentication/v1beta1/types.go b/pkg/apis/clientauthentication/v1beta1/types.go
index a3119f15..4c3cbc8b 100644
--- a/pkg/apis/clientauthentication/v1beta1/types.go
+++ b/pkg/apis/clientauthentication/v1beta1/types.go
@@ -96,7 +96,8 @@ type Cluster struct {
 	// Config holds additional config data that is specific to the exec
 	// plugin with regards to the cluster being authenticated to.
 	//
-	// This data is sourced from the clientcmd Cluster object's extensions[exec] field:
+	// This data is sourced from the clientcmd Cluster object's
+	// extensions[client.authentication.k8s.io/exec] field:
 	//
 	// clusters:
 	// - name: my-cluster