diff --git a/exercises/reverse-string/src/lib.rs b/exercises/reverse-string/src/lib.rs
index 00f0cfe3e..5677ae0b8 100644
--- a/exercises/reverse-string/src/lib.rs
+++ b/exercises/reverse-string/src/lib.rs
@@ -1,3 +1,3 @@
-pub fn reverse(_: &str) -> String {
-    unimplemented!()
+pub fn reverse(input: &str) -> String {
+    unimplemented!("Write a function to reverse {}", input);
 }