diff --git a/chacha20_poly1305/src/lib.rs b/chacha20_poly1305/src/lib.rs
index 42b2df3af..16c82a9ca 100644
--- a/chacha20_poly1305/src/lib.rs
+++ b/chacha20_poly1305/src/lib.rs
@@ -1,5 +1,7 @@
 // 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]