-Instead, prospective publishers and subscribers should use the DMaaP Bus Controller API, which will call
-the DR provisioning API to manage feeds and subscriptions.
+The Data Router (DR) provisioning client runs as a Kubernetes initContainer for ONAP DCAE applications
+that use DR feeds to transfer data between applications. The logic for the client is contained in a script
+that makes requests to the DR provisioning node using the DR provisioning API.
+(See the `API documentation <https://docs.onap.org/projects/onap-dmaap-datarouter/en/london/apis/data-router-api.html#dmaap-data-router-api>`_ for details.)
+
+The DR provisioning client (drprov-client) replaces the DMaaP Bus Controller client (dbc-client).
+The dbc-client used the DMaaP Bus Controller to provision data router feeds and subscribers and
+DMaaP Message Router topics and clients. The Message Router provisioning functionality is no longer needed,
+and Bus Controller will be deprecated and removed from the ONAP tree.