diff --git a/subjects/inv_pyramid/README.md b/subjects/inv_pyramid/README.md
index 608aa3e2..d9ee108d 100644
--- a/subjects/inv_pyramid/README.md
+++ b/subjects/inv_pyramid/README.md
@@ -26,7 +26,7 @@ i = 5
 ### Expected Functions
 
 ```rust
-fn inv_pyramid(v: &str, i: u32) -> Vec<&str> {}
+fn inv_pyramid(v: String, i: u32) -> Vec<String> {}
 ```
 
 ### Usage