diff --git a/src/main/test/java/example/readme/Test3.java b/src/main/test/java/example/readme/Test3.java
index 5a11b20..b42d23b 100644
--- a/src/main/test/java/example/readme/Test3.java
+++ b/src/main/test/java/example/readme/Test3.java
@@ -20,6 +20,7 @@ public class Test3 {
         ImageCaptchaInfo imageCaptchaInfo = imageCaptchaGenerator.generateCaptchaImage(GenerateParam.builder()
                 .type(CaptchaTypeConstant.SLIDER)
                 .templateFormatName("jpeg")
+                // 设置背景图片格式
                 .backgroundFormatName("png")
                 // 是否添加混淆滑块
                 .obfuscate(true)