diff --git a/src/app.rs b/src/app.rs
index 860b6ab..b99bee9 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1,3 +1,5 @@
+//! Main application state and options.
+
 use std::collections::{BTreeMap, HashMap};
 use std::path::absolute;
 use std::vec::Vec;
@@ -47,6 +49,7 @@ pub enum ActiveTool {
     Measure,
 }
 
+/// Contains all configurable options of the application.
 #[derive(Debug, Default, Serialize, Deserialize)]
 pub struct AppOptions {
     pub version: String,
@@ -85,6 +88,7 @@ pub struct SessionData {
     pub grid_lenses: HashMap<String, egui::Pos2>,
 }
 
+/// Main application state, implements the `eframe::App` trait.
 #[derive(Default)]
 pub struct AppState {
     pub options: AppOptions,
diff --git a/src/lib.rs b/src/lib.rs
index 3b88d2a..b60ee02 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,10 @@
+//! Library target of the `maps` app.
+//!
+//! The public components listed here can be reused in external applications.
+//!
+//! Note that public API is not the main focus of this app crate.
+//! But feel free to use parts of it as you see fit.
+
 pub mod app;
 mod app_impl;
 mod draw_order;
diff --git a/src/map_pose.rs b/src/map_pose.rs
index 33e1131..31a526d 100644
--- a/src/map_pose.rs
+++ b/src/map_pose.rs
@@ -1,3 +1,5 @@
+//! Pose utilities for map alignment.
+
 use std::path::PathBuf;
 
 use eframe::emath;
diff --git a/src/meta.rs b/src/meta.rs
index 6c06762..9aae1d1 100644
--- a/src/meta.rs
+++ b/src/meta.rs
@@ -1,3 +1,5 @@
+//! Map metadata.
+
 use eframe::emath;
 use log::debug;
 use serde::{Deserialize, Serialize};
diff --git a/src/value_colormap.rs b/src/value_colormap.rs
index 1be3ba3..9f4632d 100644
--- a/src/value_colormap.rs
+++ b/src/value_colormap.rs
@@ -1,9 +1,11 @@
+//! Color map implementations.
+
 use image::Rgba;
 use lazy_static::lazy_static;
 use serde::{Deserialize, Serialize};
 use strum_macros::Display;
 
-/// Color mapping from cell values to RGBA colors.
+/// Trait for color mapping from cell values to RGBA colors.
 pub trait ValueColorMap {
     fn map(&self, value: u8) -> Rgba<u8>;
 }
@@ -27,7 +29,8 @@ pub enum ColorMap {
 }
 
 impl ColorMap {
-    /// Gives access to the corresponding color map implementation.
+    /// Gives access to the corresponding color map trait implementations
+    /// that are implemented in this module.
     pub fn get(&self) -> &dyn ValueColorMap {
         match self {
             ColorMap::RvizMap => &*RVIZ_MAP,
diff --git a/src/value_interpretation.rs b/src/value_interpretation.rs
index 05243a4..4574592 100644
--- a/src/value_interpretation.rs
+++ b/src/value_interpretation.rs
@@ -1,6 +1,6 @@
 //! Value thresholding options.
 //! Mostly follows ROS: wiki.ros.org/map_server#Value_Interpretation
-//! 
+//!
 //! Since the nav map_server slightly deviates from that documentation,
 //! it's also possible to mimic its behavior.