diff --git a/orm/README.md b/orm/README.md
index e717bf90..ae3fed09 100644
--- a/orm/README.md
+++ b/orm/README.md
@@ -119,7 +119,6 @@ userEntityCaches.update(entity);
 - Supports basic data properties (byte, short, int, long, float, double, boolean), string String, custom objects, does
   not support generics
 - Arrays support one-dimensional arrays, and collections support List, Set
-- Map type: Mongo DB officially restricts key to String
 - Database primary keys can use integers as much as possible, because Mongo DB's default primary key is a string, which
   takes up space
 - The database uses a self-developed ORM framework, such as an entity class User Entity, which maps to the collection in
diff --git a/orm/README_CN.md b/orm/README_CN.md
index 3feea0d2..2e45dcfc 100644
--- a/orm/README_CN.md
+++ b/orm/README_CN.md
@@ -113,7 +113,6 @@ userEntityCaches.update(entity);
 - 如果不想映射某属性，直接加上transient关键字
 - 支持基本数据属性（byte，short，int，long，float，double，boolean），字符串String，自定义对象，不支持泛型
 - 数组支持一维数组，集合支持List，Set
-- Map类型MongoDB官方限定了key只能为String
 - 数据库主键能用整数尽量用整数，因为MongoDB默认的主键是一个字符串，比较占空间
 - 数据库使用自研的orm框架，比如一个实体类UserEntity，映射到数据库中的集合为user，首字母小写，去掉Entity
 - 智能语法分析，不支持泛型和循环引用的对象，错误的entity对象定义将无法启动程序并给出错误警告
diff --git a/orm/src/main/java/com/zfoo/orm/manager/OrmManager.java b/orm/src/main/java/com/zfoo/orm/manager/OrmManager.java
index 82c3941d..3622b7a2 100644
--- a/orm/src/main/java/com/zfoo/orm/manager/OrmManager.java
+++ b/orm/src/main/java/com/zfoo/orm/manager/OrmManager.java
@@ -572,7 +572,6 @@ public class OrmManager implements IOrmManager {
                 var keyType = types[0];
                 var valueType = types[1];
                 if (!ClassUtils.isBaseType((Class<?>) keyType)) {
-                    // ORM中Map的key必须是String类型
                     throw new RunException("The key of the map in the ORM must be of the Base type");
                 }
                 checkSubEntity(currentEntityClass, valueType);