diff --git a/index.yaml b/index.yaml
new file mode 100644
index 00000000..edd99f08
--- /dev/null
+++ b/index.yaml
@@ -0,0 +1,14 @@
+apiVersion: v1
+entries:
+  mantle-cluster-wide:
+  - apiVersion: v2
+    appVersion: 0.1.0
+    created: "2024-06-26T01:44:51.773089003Z"
+    description: A Helm chart for Kubernetes
+    digest: 592818cad323e371ac2eb3ebd448c14c96879eedead750a5e0991e5f2371e1db
+    name: mantle-cluster-wide
+    type: application
+    urls:
+    - https://github.com/cybozu-go/mantle/releases/download/mantle-cluster-wide-chart-v0.1.0/mantle-cluster-wide-0.1.0.tgz
+    version: 0.1.0
+generated: "2024-06-26T01:44:51.773096236Z"