diff --git a/firestore.indexes.json b/firestore.indexes.json
index ac88ccf6..e611f18a 100644
--- a/firestore.indexes.json
+++ b/firestore.indexes.json
@@ -242,6 +242,10 @@
           "arrayConfig": "CONTAINS",
           "queryScope": "COLLECTION"
         },
+        {
+          "order": "ASCENDING",
+          "queryScope": "COLLECTION_GROUP"
+        },
         {
           "order": "DESCENDING",
           "queryScope": "COLLECTION_GROUP"