diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 3dd5be33aaa7b0..a260bf7cff6915 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -12,7 +12,8 @@
  * addresses must be multiplied by 16 to obtain their respective linear
  * addresses. To avoid confusion, linear addresses are written using leading
  * hex while segment addresses are written as segment:offset.
- *
+ * 
+ * 在实模式使用64k段,所以,段地址 * 16 = 线性地址
  */
 
 #include <asm/segment.h>