diff --git a/README.md b/README.md
index 1450031..e149443 100644
--- a/README.md
+++ b/README.md
@@ -143,7 +143,7 @@ let requestOptin = new RequestOption();
       // 左上圆角10pixel像素点
     .roundedCorners({top:10})
     // 启动加载流程，执行结果将会返回到上面的回调接口中
-    ImageKnife.call(requestOptin);
+    globalThis.ImageKnife.call(requestOptin);
 ```
 
 ##### 步骤4：