diff --git a/library/std/src/io/prelude.rs b/library/std/src/io/prelude.rs
index 3baab2be3779..700f166daf77 100644
--- a/library/std/src/io/prelude.rs
+++ b/library/std/src/io/prelude.rs
@@ -1,4 +1,4 @@
-//! The I/O Prelude
+//! # The I/O Prelude
 //!
 //! The purpose of this module is to alleviate imports of many common I/O traits
 //! by adding a glob import to the top of I/O heavy modules: