diff --git a/README.md b/README.md
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@@ -1,6 +1,8 @@
 # CSI Snapshotter
 
-The CSI external-snapshotter is part of Kubernetes implementation of [Container Storage Interface (CSI)](https://github.com/container-storage-interface/spec)
+The CSI external-snapshotter is part of Kubernetes implementation of [Container Storage Interface (CSI)](https://github.com/container-storage-interface/spec).
+
+The volume snapshot feature supports CSI v1.0 and it has been an Alpha feature in Kubernetes since v1.12. 
 
 ## Overview