diff --git a/docs/howToUse.md b/docs/howToUse.md
index dbf5b68e1fa80d3f99864a9ff3f39de264b71d05..004ad17d73feb074d240601fff60c1fcc1f2a375 100644
--- a/docs/howToUse.md
+++ b/docs/howToUse.md
@@ -222,8 +222,8 @@ def <init>(int: Int, j: Int, k: Option[String], t: Option[Long], b: Int) = {
 - 说明
   - `verbose` 指定是否开启详细编译日志。可选，默认`false`。
   - `excludeFields` 指定是否需要排除不需要用于`equals`和`hashCode`方法的字段。可选，默认空（class内部所有非私有的`var、val`字段都将被应用于生成这两个方法）。
-  - `equals`和`hashCode`方法均会被超类的影响，`canEqual`使用`isInstanceOf`。
-  - 采用简单hashCode算法，父类的hashCode是直接被累加的。
+  - `equals`和`hashCode`方法均会被超类影响，`canEqual`使用`isInstanceOf`，有些人在实现时，使用的是`this.getClass == that.getClass`。
+  - 采用简单hashCode算法，父类的hashCode是直接被累加的。该算法是`case class`使用的。
 
 - 示例
 
diff --git a/docs/howToUse_en.md b/docs/howToUse_en.md
index e28f0c14dd72c99df6d7a9db3b04ad1d97760adf..c9cd0a3a08205f7c86eccf70436c7c685be2ca7c 100644
--- a/docs/howToUse_en.md
+++ b/docs/howToUse_en.md
@@ -229,7 +229,7 @@ The `@equalsAndHashCode` annotation is used to generate `equals` and `hashCode`
       default is `Nil` (all non private `var` and `val` fields in the class will be used to generate the two methods). 
     - Both `equals` and `hashCode` methods are affected by super classes, and `canEqual` uses `isInstanceOf` in `equals` method.
       Some equals implementations use `that.getClass == this.getClass`
-    - It uses simple hashcode algorithm, and the hashcodes of the parent class are accumulated directly.
+    - It uses simple hashcode algorithm, and the hashcodes of the parent class are accumulated directly. The algorithm is also used by `case class`. 
   
 - Example