diff --git a/docs/horizontal_pod_autoscaling.md b/docs/horizontal_pod_autoscaling.md
index bbc17dee1e..517496ffb6 100644
--- a/docs/horizontal_pod_autoscaling.md
+++ b/docs/horizontal_pod_autoscaling.md
@@ -68,6 +68,7 @@ compatibility matrix is as follows:
 
 Metrics Server | Metrics API group/version | Supported Kubernetes version
 ---------------|---------------------------|-----------------------------
+0.3.x          | `metrics.k8s.io/v1beta1`  | 1.8+
 0.2.x          | `metrics.k8s.io/v1beta1`  | 1.8+
 0.1.x          | `metrics/v1alpha1`        | 1.7