diff --git a/library/std/src/io/prelude.rs b/library/std/src/io/prelude.rs
index 700f166daf7..d80643101f2 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:
diff --git a/library/std/src/prelude/mod.rs b/library/std/src/prelude/mod.rs
index 08f3ff5f253..eb2095b8196 100644
--- a/library/std/src/prelude/mod.rs
+++ b/library/std/src/prelude/mod.rs
@@ -1,4 +1,4 @@
-//! The Rust Prelude.
+//! # The Rust Prelude
 //!
 //! Rust comes with a variety of things in its standard library. However, if
 //! you had to manually import every single thing that you used, it would be