diff --git a/docs/guide/advanced/grouped-table.html b/docs/guide/advanced/grouped-table.html
index 94aa5e31..e1fdc628 100644
--- a/docs/guide/advanced/grouped-table.html
+++ b/docs/guide/advanced/grouped-table.html
@@ -343,7 +343,7 @@
   :rows="rows"
   :group-options="{
     enabled: true,
-    rowKey="id"
+    rowKey:'id'
     collapsable: true // or column index
   }"
 >