diff --git a/src/event_source.rs b/src/event_source.rs
index d0eb2f7..99e56a6 100644
--- a/src/event_source.rs
+++ b/src/event_source.rs
@@ -1,3 +1,4 @@
+//! Abstraction around event sourcing for the checklist application.
 use anyhow::Result;
 use crossterm::event::{self, Event};
 use std::time::Duration;
diff --git a/src/todo_list.rs b/src/todo_list.rs
index 4d601db..4b41dd5 100644
--- a/src/todo_list.rs
+++ b/src/todo_list.rs
@@ -1,3 +1,4 @@
+//! Todo list UI component for the checklist application.
 use ratatui::style::Style;
 use ratatui::widgets::{Block, Borders, List, ListItem, ListState};
 // use Frame via the crate root type `ratatui::Frame` in the signature below