diff --git a/X. Appendices/D.2. Spring Boot’s “JarFile” class.md b/X. Appendices/D.2. Spring Boot’s “JarFile” class.md
index e69de29..3a6567e 100644
--- a/X. Appendices/D.2. Spring Boot’s “JarFile” class.md	
+++ b/X. Appendices/D.2. Spring Boot’s “JarFile” class.md	
@@ -0,0 +1,3 @@
+### 附录D.2. Spring Boot的"JarFile"类
+
+Spring Boot用于支持加载内嵌jars的核心类是`org.springframework.boot.loader.jar.JarFile`。它允许你从一个标准的jar文件或内嵌的子jar数据中加载jar内容。