diff --git a/src/ch07-01-mod-and-the-filesystem.md b/src/ch07-01-mod-and-the-filesystem.md
index 6ce5de4..37f6ab2 100644
--- a/src/ch07-01-mod-and-the-filesystem.md
+++ b/src/ch07-01-mod-and-the-filesystem.md
@@ -96,7 +96,7 @@ communicator
  └── client
 ```
 
-而这是示例 7-2 中例子的的层次结构：
+而这是示例 7-2 中例子的层次结构：
 
 ```text
 communicator