diff --git a/listings/ch04-understanding-ownership/no-listing-08-reference-with-annotations/src/main.rs b/listings/ch04-understanding-ownership/no-listing-08-reference-with-annotations/src/main.rs
index d39c64a..4d916e3 100755
--- a/listings/ch04-understanding-ownership/no-listing-08-reference-with-annotations/src/main.rs
+++ b/listings/ch04-understanding-ownership/no-listing-08-reference-with-annotations/src/main.rs
@@ -7,7 +7,7 @@ fn main() {
 }
 
 // ANCHOR: here
-fn calculate_length(s: &String) -> usize { // s is a reference to a String
+fn calculate_length(s: &String) -> usize { // s是String的引用
     s.len()
 } // 这里，s 离开了作用域。但因为它并不拥有引用值的所有权，
   // 所以什么也不会发生