diff --git a/exercises/21_async/README.md b/exercises/21_async/README.md
index 547fb29b..8bdaeb7d 100644
--- a/exercises/21_async/README.md
+++ b/exercises/21_async/README.md
@@ -13,4 +13,4 @@ by enabling them to handle multiple tasks simultaneously.
 
 - [Asynchronous Programming in Rust](https://doc.rust-lang.org/book/ch17-00-async-await.html)
 - [Learn Tokio](https://tokio.rs/tokio/tutorial/)
-- [Tokio Documentation](https://docs.rs/tokio/latest/tokio/)
\ No newline at end of file
+- [Tokio Documentation](https://docs.rs/tokio/latest/tokio/)