diff --git a/Booting/linux-bootstrap-2md.md b/Booting/linux-bootstrap-2md.md
index 0c1e289..e5ca461 100644
--- a/Booting/linux-bootstrap-2md.md
+++ b/Booting/linux-bootstrap-2md.md
@@ -1,4 +1,5 @@
 # 在内核安装代码的第一步
+#https://0xax.gitbooks.io/linux-insides/content/Booting/linux-bootstrap-2.html
 
 内核启动的第一步  
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