Update README.md

Author: gp510

README.md

@@ -1,7 +1,11 @@
 [![CircleCI](https://circleci.com/gh/git-lfs/git-lfs.svg?style=shield&circle-token=856152c2b02bfd236f54d21e1f581f3e4ebf47ad)](https://circleci.com/gh/splunk/fluent-plugin-kubernetes-metrics)
 # fluent-plugin-kubernetes-metrics
 
-The[Fluentd](https://fluentd.org/) input plugin collects kubernetes cluster metrics from the Summary API, which are exposed by [Kubelet](https://kubernetes.io/docs/admin/kubelet/) on each node.
+The [Fluentd](https://fluentd.org/) input plugin collects kubernetes cluster metrics which are exposed by the [Kubelet API](https://kubernetes.io/docs/admin/kubelet/) and forwards them to fluentd.
+The plugin collects metrics from:
+   * The kubelet summary API
+   * The kubelet stats API
+   * The cAdvisor metrics API
 
 The Fluentd input plugin can be configured to fetch metrics from either the Kublernetes API server or from the Kubelet itself.