diff --git a/chacha20_poly1305/src/lib.rs b/chacha20_poly1305/src/lib.rs
index 42b2df3af..0deea843d 100644
--- a/chacha20_poly1305/src/lib.rs
+++ b/chacha20_poly1305/src/lib.rs
@@ -1,7 +1,10 @@
 // SPDX-License-Identifier: CC0-1.0
 
+//! # ChaCha20 - Poly1305
+//!
 //! Combine the ChaCha20 stream cipher with the Poly1305 message authentication code
 //! to form an authenticated encryption with additional data (AEAD) algorithm.
+
 #![no_std]
 // Experimental features we need.
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
diff --git a/hashes/src/lib.rs b/hashes/src/lib.rs
index 2b8d5924c..06cfbcda3 100644
--- a/hashes/src/lib.rs
+++ b/hashes/src/lib.rs
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: CC0-1.0
 
-//! Rust hashes library.
+//! # Rust Bitcoin Hashes Library
 //!
 //! This library implements the hash functions needed by Bitcoin. As an ancillary thing, it exposes
 //! hexadecimal serialization and deserialization, since these are needed to display hashes.
diff --git a/io/src/lib.rs b/io/src/lib.rs
index 3c020d0b4..0b7ee5093 100644
--- a/io/src/lib.rs
+++ b/io/src/lib.rs
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: CC0-1.0
 
-//! Rust-Bitcoin I/O Library
+//! # Rust Bitcoin I/O Library
 //!
 //! The [`std::io`] module is not exposed in `no-std` Rust so building `no-std` applications which
 //! require reading and writing objects via standard traits is not generally possible. Thus, this
diff --git a/primitives/src/lib.rs b/primitives/src/lib.rs
index 451a3c166..f73a7ce17 100644
--- a/primitives/src/lib.rs
+++ b/primitives/src/lib.rs
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: CC0-1.0
 
-//! # Rust Bitcoin - primitive types.
+//! # Rust Bitcoin - primitive types
 //!
 //! Primitive data types that are used throughout the [`rust-bitcoin`] ecosystem.
 //!
diff --git a/units/src/lib.rs b/units/src/lib.rs
index 4d3be98ac..5a9742986 100644
--- a/units/src/lib.rs
+++ b/units/src/lib.rs
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: CC0-1.0
 
-//! Rust Bitcoin units library
+//! # Rust Bitcoin - unit types
 //!
 //! This library provides basic types used by the Rust Bitcoin ecosystem.