diff --git a/docs/uniCloud/cf-database.md b/docs/uniCloud/cf-database.md
index 1cba2b51fe60d054f3744a5b87d8a108c862b622..f681a9ca91df0ca03346a9f91593d5f5b63f7b0b 100644
--- a/docs/uniCloud/cf-database.md
+++ b/docs/uniCloud/cf-database.md
@@ -610,8 +610,13 @@ collection.doc('doc-id').update({
 ```
 
 ### 更新文档，如果不存在则创建
+
 collection.doc().set()
 
+**注意：**
+
+- 此方法会覆写已有字段，需注意与`update`表现不同，比如以下示例执行`set`之后`follow`字段会被删除
+
 ```js
 collection.doc('doc-id').set({
   name: "Hey",