diff --git a/src/ch09-02-recoverable-errors-with-result.md b/src/ch09-02-recoverable-errors-with-result.md
index 65be5fb6..3b663b4a 100644
--- a/src/ch09-02-recoverable-errors-with-result.md
+++ b/src/ch09-02-recoverable-errors-with-result.md
@@ -432,7 +432,7 @@ use std::fs::File;
 
 fn main() {
     // hello.txtを開くのに失敗しました
-    let f = File::open("hello.txt").expect("Failed to open hello.txt");
+    let f = File::open("hello.txt").expect("hello.txt should be included in this project");
 }
 ```