diff --git a/src/main.rs b/src/main.rs
index e5e775f..06f1766 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -23,6 +23,7 @@ use crate::states::AppState;
 async fn init() -> Result<()> {
     let app_state = AppState::build()?;
 
+    // The path prefix of all routes.
     let path_prefix = app_state.config.path_prefix.clone();
 
     let socket_address = app_state
@@ -37,6 +38,7 @@ async fn init() -> Result<()> {
         app_state.config.utc_offset.minutes,
     )?;
 
+    // The service for serving the static files.
     let static_service =
         get_service(ServeDir::new("static")).handle_error(|_| ready(StatusCode::NOT_FOUND));
 
diff --git a/src/states.rs b/src/states.rs
index 2238fdb..330f935 100644
--- a/src/states.rs
+++ b/src/states.rs
@@ -4,6 +4,7 @@ use std::sync::{Arc, Mutex};
 
 use crate::{captcha_solutions::CaptchaSolutions, config::Config, mailer::Mailer};
 
+/// The application state.
 #[derive(Clone, FromRef)]
 pub struct AppState {
     pub config: Arc<Config>,
@@ -12,11 +13,13 @@ pub struct AppState {
 }
 
 impl AppState {
+    /// Try to build the app state.
     pub fn build() -> Result<Self> {
         let config = Config::build()?;
         let mailer = Arc::new(Mailer::build(&config)?);
 
         let config = Arc::new(config);
+        // Mutex for write access.
         let captcha_solutions = Arc::new(Mutex::new(CaptchaSolutions::default()));
 
         Ok(Self {
diff --git a/src/templates.rs b/src/templates.rs
index b56dbf8..47bd51d 100644
--- a/src/templates.rs
+++ b/src/templates.rs
@@ -2,11 +2,13 @@ use askama::Template;
 
 use crate::{config, forms::PersistantContactFormFields};
 
+/// Base template.
 pub struct Base<'a> {
     pub lang: &'a str,
     pub path_prefix: &'a str,
 }
 
+/// Contact form template.
 #[derive(Template)]
 #[template(path = "contact_form.askama.html")]
 pub struct ContactForm<'a> {
@@ -19,6 +21,7 @@ pub struct ContactForm<'a> {
     pub strings: &'a config::Strings,
 }
 
+/// Sucessful contact form submission template.
 #[derive(Template)]
 #[template(path = "success.askama.html")]
 pub struct Success<'a> {