diff --git a/release-notes/v1_121_update.md b/release-notes/v1_121_update.md
new file mode 100644
index 0000000000..f5438292c6
--- /dev/null
+++ b/release-notes/v1_121_update.md
@@ -0,0 +1,30 @@
+---
+{
+  "title": "New in VS Code 1.121",
+  "features": [
+    {
+      "icon": "hubot",
+      "title": "Agents window (preview)",
+      "description": "The Agents window is built for agent-driven development across multiple projects and sessions."
+    },
+    {
+      "icon": "markdown",
+      "title": "Built-in Mermaid diagrams",
+      "description": "Mermaid diagrams now render natively in the Markdown preview, notebook Markdown cells, and chat."
+    }
+  ],
+  "buttons": [
+    {
+      "label": "Open Agents Window",
+      "commandId": "workbench.action.openAgentsWindow",
+      "style": "primary"
+    },
+    {
+      "label": "Show Release Notes",
+      "commandId": "update.showCurrentReleaseNotes",
+      "style": "secondary",
+      "args": ["1.121.0"]
+    }
+  ]
+}
+---
\ No newline at end of file