diff --git a/DbContext.md b/DbContext.md
index 1d0778c..c68308c 100644
--- a/DbContext.md
+++ b/DbContext.md
@@ -18,6 +18,8 @@ using (var ctx = fsql.CreateDbContext()) {
 }
 ```
 
+> 注意：DbContext 对象多线程不安全
+
 1、在 OnConfiguring 方法上配置与 IFreeSql 关联
 
 ```csharp
diff --git a/Repository.md b/Repository.md
index 3409a7c..e362b56 100644
--- a/Repository.md
+++ b/Repository.md
@@ -28,6 +28,8 @@ var curd1 = fsql.GetRepository<Song, int>();
 var curd2 = fsql.GetGuidRepository<Song>();
 ```
 
+> 注意：BaseRepository 对象多线程不安全
+
 2、继承现实；
 
 ```csharp