diff --git a/docs/notes/02_c-leap/07_xdx/index.md b/docs/notes/02_c-leap/07_xdx/index.md
index 377b7fe..99c0d53 100644
--- a/docs/notes/02_c-leap/07_xdx/index.md
+++ b/docs/notes/02_c-leap/07_xdx/index.md
@@ -2256,7 +2256,12 @@ int main() {
 
 
 
-* 示例：单
+* 示例：单链表
+
+```c
+```
+
+