diff --git a/08-Security_Upgrade/README.md b/08-Security_Upgrade/README.md
index 6dd5618..843b181 100644
--- a/08-Security_Upgrade/README.md
+++ b/08-Security_Upgrade/README.md
@@ -40,6 +40,7 @@ BootROM → 加载并验证一级Bootloader → 加载并验证二级Bootloader
 - 信任链传递：
 
 每个阶段只信任经过上一阶段验证的代码。
+
 2. 数字签名验证流程
 ```c
 // 简化的签名验证伪代码