update

Entity-Relationship.md

@@ -53,6 +53,10 @@ Priority: Attribute> FluentApi
 
 2. The string set by Navigate is the property name of the type, NOT THE TABLE IR FIELD NAME.
 
+> extend:
+
+- [Create non primary key navigation attributes OneToOne/ManyToOne](https://github.com/dotnetcore/FreeSql/issues/604)
+
 ## Detect Navigation Properties
 
 How to detect whether a navigation property is configured to take effect:

实体关系.md

@@ -53,6 +53,10 @@ fsql.CodeFirst.ConfigEntity<实体类>(a => a
 
 2、Navigate 设置的字符串是 类属性名，不是表 字段名！！！
 
+> 扩展：
+
+- [如何建立非主键导航属性 OneToOne/ManyToOne](https://github.com/dotnetcore/FreeSql/issues/604)
+
 # 检测导航属性
 
 如何检测一个导航属性是否配置生效：