diff --git a/ch02/README.md b/ch02/README.md
index bd95644..b337082 100644
--- a/ch02/README.md
+++ b/ch02/README.md
@@ -245,7 +245,7 @@ std::cout << i << " " << ri << std::endl;
 
 输出：
 ```
-10, 10
+10 10
 ```
 
 ## 练习2.18