diff --git a/orm/src/main/java/com/zfoo/orm/model/entity/IEntity.java b/orm/src/main/java/com/zfoo/orm/model/entity/IEntity.java
index a15dbb2f..8c557d8e 100644
--- a/orm/src/main/java/com/zfoo/orm/model/entity/IEntity.java
+++ b/orm/src/main/java/com/zfoo/orm/model/entity/IEntity.java
@@ -22,7 +22,7 @@ import com.zfoo.protocol.util.StringUtils;
 public interface IEntity<PK extends Comparable<PK>> {
 
     /**
-     * 一个文档的主键
+     * 一个文档的主键 primary key
      */
     PK id();