diff --git a/docs/uniCloud/cf-database.md b/docs/uniCloud/cf-database.md
index a9d19886bc3b5a6356a9ed902e20161ff7c49bb7..f69de95fe9bd0f68671a5e0bff24218c91462a8e 100644
--- a/docs/uniCloud/cf-database.md
+++ b/docs/uniCloud/cf-database.md
@@ -5609,7 +5609,7 @@ let res = await db.collection('sales').aggregate()
 ```js
 { _id: 1, sales: 5 }
 { _id: 2, sales: 1 }
-{ _id: 3, sales: -6 }
+{ _id: 3, sales: -4 }
 ```
 
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