diff --git a/src/gb.rs b/src/gb.rs
index b63a5478efad47a3bb3b6c6863d94645295bd1d9..10f219934505912ccc84116d2a8e1a115ad0ff31 100644
--- a/src/gb.rs
+++ b/src/gb.rs
@@ -1,3 +1,5 @@
+//! Main GameBoy emulation entrypoint functions and structures.
+
 use std::{
     cell::RefCell,
     collections::VecDeque,
diff --git a/src/mmu.rs b/src/mmu.rs
index ab6afb8825d07bcfb9d96ba09e6406f3fef20b82..716a7520638f660781b229f7f770067a3888ac5e 100644
--- a/src/mmu.rs
+++ b/src/mmu.rs
@@ -1,3 +1,5 @@
+//! MMU (Memory Management Unit) functions and structures.
+
 use std::{cell::RefCell, rc::Rc};
 
 use crate::{
diff --git a/src/pad.rs b/src/pad.rs
index eff48b55578fa515959d3b538711223cea827438..f58c1265ac94b8b24f40b2d11f939783c5e1bd4d 100644
--- a/src/pad.rs
+++ b/src/pad.rs
@@ -1,3 +1,5 @@
+//! Gamepad related functions and structures.
+
 use crate::warnln;
 
 #[cfg(feature = "wasm")]
diff --git a/src/ppu.rs b/src/ppu.rs
index 9443a01452ce062bb69cec33239c81497165ffff..1d85fde69e16697d27b3c106d4d7d9f608dcbeca 100644
--- a/src/ppu.rs
+++ b/src/ppu.rs
@@ -1,3 +1,5 @@
+//! PPU (Picture Processing Unit) functions and structures.
+
 use core::fmt;
 use std::{
     borrow::BorrowMut,