diff --git a/src/std-traits/exercise.md b/src/std-traits/exercise.md
index dcc484f9a3ae..6a5abe5a954f 100644
--- a/src/std-traits/exercise.md
+++ b/src/std-traits/exercise.md
@@ -6,7 +6,8 @@ minutes: 30
 
 In this example, you will implement the classic
 ["ROT13" cipher](https://en.wikipedia.org/wiki/ROT13). Copy this code to the
-playground, and implement the missing bits. Only rotate ASCII alphabetic
+[playground](https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=d3ad23a195b8c8f56a007cc6b1ab8eb8)
+, and implement the missing bits. Only rotate ASCII alphabetic
 characters, to ensure the result is still valid UTF-8.
 
 ```rust,editable