diff --git a/book/contents/basic/compound-type/string-slice.md b/book/contents/basic/compound-type/string-slice.md
index 0bf8efab..0b60b76c 100644
--- a/book/contents/basic/compound-type/string-slice.md
+++ b/book/contents/basic/compound-type/string-slice.md
@@ -167,7 +167,7 @@ Rust在语言级别，只有一种字符串类型：`str`，它通常是以引
 fn main() {
     // 创建一个空String
     let mut s = String::new();
-    // 将&str类型的"hello,world"添加到中
+    // 将&str类型的"hello,world"添加到s中
     s.push_str("hello,world");
     // 将字符'!'推入s中
     s.push('!');