diff --git a/telemetry/definitions/commonDefinitions.json b/telemetry/definitions/commonDefinitions.json
index 0aa5c3b0..fb706966 100644
--- a/telemetry/definitions/commonDefinitions.json
+++ b/telemetry/definitions/commonDefinitions.json
@@ -1468,6 +1468,11 @@
             "type": "string",
             "description": "A generic version metadata"
         },
+        {
+            "name": "windowId",
+            "type": "string",
+            "description": "An identifier for a specific IDE window, since there can be multiple windows from the same IDE open on a machine."
+        },
         {
             "name": "workflowToken",
             "type": "string",