diff --git a/CHANGELOG-2.1.md b/CHANGELOG-2.1.md
new file mode 100644
index 000000000..3acc129ad
--- /dev/null
+++ b/CHANGELOG-2.1.md
@@ -0,0 +1,34 @@
+# Changelog since v2.0.0
+
+## New Features
+
+### Snapshot Controller
+
+- The number of worker threads in the snapshot-controller is now configurable via the `worker-threads` flag. ([#282](https://github.com/kubernetes-csi/external-snapshotter/pull/282), [@huffmanca](https://github.com/huffmanca))
+
+### CSI External-Snapshotter Sidecar
+
+- The number of worker threads in the csi-snapshotter is now configurable via the `worker-threads` flag. ([#282](https://github.com/kubernetes-csi/external-snapshotter/pull/282), [@huffmanca](https://github.com/huffmanca))
+- Adds support for ListSnapshots secrets ([#252](https://github.com/kubernetes-csi/external-snapshotter/pull/252), [@bells17](https://github.com/bells17))
+
+## Breaking Changes
+
+- Update package path to v2. Vendoring with dep depends on https://github.com/golang/dep/pull/1963 or the workaround described in v2/README.md. ([#240](https://github.com/kubernetes-csi/external-snapshotter/pull/240), [@alex1989hu](https://github.com/alex1989hu))
+
+## Bug Fixes
+
+### Snapshot Controller
+
+- Fixes a problem of not removing the PVC finalizer when it is no longer used by a snapshot as source. ([#283](https://github.com/kubernetes-csi/external-snapshotter/pull/283), [@xing-yang](https://github.com/xing-yang))
+- Fixes a problem deleting VolumeSnapshotContent with `Retain` policy for pre-provisioned snapshots. ([#249](https://github.com/kubernetes-csi/external-snapshotter/pull/249), [@xing-yang](https://github.com/xing-yang))
+- Allows the volume snapshot to be deleted if the volume snapshot class is not found. ([#275](https://github.com/kubernetes-csi/external-snapshotter/pull/275), [@huffmanca](https://github.com/huffmanca))
+
+### CSI External-Snapshotter Sidecar
+
+- Fixes a create snapshot timeout issue. ([#261](https://github.com/kubernetes-csi/external-snapshotter/pull/261), [@xing-yang](https://github.com/xing-yang))
+
+## Other Notable Changes
+
+### API Changes
+
+- Prints additional details when using kubectl get on VolumeSnapshot, VolumeSnapshotContent, and VolumeSnapshotClass API objects. ([#260](https://github.com/kubernetes-csi/external-snapshotter/pull/260), [@huffmanca](https://github.com/huffmanca))
diff --git a/README.md b/README.md
index 325b08e8f..53b7610d3 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,8 @@ Install CSI Driver:
 
 * `--metrics-path`: The HTTP path where prometheus metrics will be exposed. Default is `/metrics`.
 
+* `--worker-threads`: Number of worker threads. Default value is 10.
+
 #### Other recognized arguments
 * `--kubeconfig <path>`: Path to Kubernetes client configuration that the snapshot controller uses to connect to Kubernetes API server. When omitted, default token provided by Kubernetes will be used. This option is useful only when the snapshot controller does not run as a Kubernetes pod, e.g. for debugging.
 
@@ -113,6 +115,8 @@ Install CSI Driver:
 
 * `snapshot-name-uuid-length`: Length in characters for the generated uuid of a created snapshot. Defaults behavior is to NOT truncate.
 
+* `--worker-threads`: Number of worker threads for running create snapshot and delete snapshot operations. Default value is 10.
+
 #### Other recognized arguments
 * `--kubeconfig <path>`: Path to Kubernetes client configuration that the CSI external-snapshotter uses to connect to Kubernetes API server. When omitted, default token provided by Kubernetes will be used. This option is useful only when the external-snapshotter does not run as a Kubernetes pod, e.g. for debugging.