Update csi-dev.md

andyzhangx · web-flow · commit 733221bb8e9a · 2020-08-12T10:02:40.000+08:00
diff --git a/docs/csi-dev.md b/docs/csi-dev.md
@@ -104,3 +104,9 @@ $  csc controller create-snapshot
 ```console
 $  csc controller delete-snapshot
 ```
+
+### How to update chart index
+
+```console
+helm repo index charts --url=https://raw.githubusercontent.com/kubernetes-sigs/blobfuse-csi-driver/master/charts
+```
