diff --git a/packages/pulumi/src/executors/preview/schema.json b/packages/pulumi/src/executors/preview/schema.json
index 1c0ed2f3..26d1dd9a 100644
--- a/packages/pulumi/src/executors/preview/schema.json
+++ b/packages/pulumi/src/executors/preview/schema.json
@@ -6,6 +6,10 @@
   "title": "Preview executor",
   "description": "Preview",
   "properties": {
+    "stack": {
+      "type": "string",
+      "description": "The target stack to use, if specified."
+    },
     "root": {
       "type": "string",
       "description": "The working directory to run Pulumi commands from, if specified."