diff --git a/library/src/main/java/com/lijiankun24/shadowlayout/ShadowLayout.java b/library/src/main/java/com/lijiankun24/shadowlayout/ShadowLayout.java
index 92993cb83e3f7021f0bab541bbf6ceedf7aedd6c..bae0487b0b637fc915503791d550618acb409ff4 100644
--- a/library/src/main/java/com/lijiankun24/shadowlayout/ShadowLayout.java
+++ b/library/src/main/java/com/lijiankun24/shadowlayout/ShadowLayout.java
@@ -219,6 +219,9 @@ public class ShadowLayout extends DependentLayout implements Component.EstimateS
 
     /**
      * 真正绘制阴影的方法
+     *
+     * @param component
+     * @param canvas
      */
     @Override
     public void onDraw(Component component, Canvas canvas) {