Include brief areas of responsibility

sig-network/README.md

@@ -8,6 +8,7 @@ A Special Interest Group for networking in Kubernetes.
 * [SIG Network Calendar](https://calendar.google.com/calendar/embed?src=ODhmZTFsM3FmbjJiNnIxMWs4dW01YW03NmNAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ)
 * Zoom Link: [https://zoom.us/j/5806599998](https://zoom.us/j/5806599998)
 * [Agenda and Minutes](https://docs.google.com/document/d/1_w77-zG_Xj0zYvEMfQZTQ-wPP4kXkpGD8smVtW_qqWM/edit)
+* Recorded meetings: TODO
 
 ## Google Group / Mailing List
 
@@ -16,11 +17,17 @@ Join the [SIG network mailing list](https://groups.google.com/forum/#!forum/kube
 Most discussion happens on the Google Group and the weekly meetings help more quickly resolve issues
 that come up in PRs or on the group.
 
-## PRs / Issues
+## Areas of Responsibility
 
-SIG Network is responsible for a number of issues and PRs.
+SIG Network is responsible for the following Kubernetes subsystems:
 
-A summary can be found through GitHub search:
+- DNS
+- Ingress
+- Network plugins / CNI
+- Network Policy
+- Services / kube-proxy
+
+SIG Network is responsible for a number of issues and PRs. A summary can be found through GitHub search:
 
 * [SIG Network PRs](https://github.com/issues?utf8=%E2%9C%93&q=team%3Akubernetes%2Fsig-network+is%3Aopen+is%3Apr+)
 * [SIG Network Issues](https://github.com/issues?utf8=%E2%9C%93&q=team%3A%22kubernetes%2Fsig-network%22+is%3Aopen+is%3Aissue)