diff --git a/src/accounts.rs b/src/accounts.rs
index 8ec3a34c8..9f013bfe6 100644
--- a/src/accounts.rs
+++ b/src/accounts.rs
@@ -476,10 +476,13 @@ impl Config {
 struct AccountConfig {
     /// Unique id.
     pub id: u32,
+
     /// Root directory for all data for this account.
     ///
     /// The path is relative to the account manager directory.
     pub dir: std::path::PathBuf,
+
+    /// Universally unique account identifier.
     pub uuid: Uuid,
 }
 
diff --git a/src/chat.rs b/src/chat.rs
index 522f55aa7..26e7a7db2 100644
--- a/src/chat.rs
+++ b/src/chat.rs
@@ -1881,7 +1881,10 @@ pub(crate) async fn update_special_chat_names(context: &Context) -> Result<()> {
 /// [`Deref`]: std::ops::Deref
 #[derive(Debug)]
 pub(crate) struct ChatIdBlocked {
+    /// Chat ID.
     pub id: ChatId,
+
+    /// Whether the chat is blocked, unblocked or a contact request.
     pub blocked: Blocked,
 }
 
diff --git a/src/configure.rs b/src/configure.rs
index 565169470..48b91a3f7 100644
--- a/src/configure.rs
+++ b/src/configure.rs
@@ -646,10 +646,14 @@ async fn try_smtp_one_param(
     }
 }
 
+/// Failure to connect and login with email client configuration.
 #[derive(Debug, thiserror::Error)]
 #[error("Trying {config}…\nError: {msg}")]
 pub struct ConfigurationError {
+    /// Tried configuration description.
     config: String,
+
+    /// Error message.
     msg: String,
 }
 
diff --git a/src/imap.rs b/src/imap.rs
index d7fcf1397..9889df69b 100644
--- a/src/imap.rs
+++ b/src/imap.rs
@@ -116,6 +116,8 @@ impl async_imap::Authenticator for OAuth2 {
 #[derive(Debug, Display, PartialEq, Eq, Clone, Copy)]
 pub enum FolderMeaning {
     Unknown,
+
+    /// Spam folder.
     Spam,
     Inbox,
     Mvbox,
@@ -149,8 +151,11 @@ impl FolderMeaning {
 
 #[derive(Debug)]
 struct ImapConfig {
+    /// Email address.
     pub addr: String,
     pub lp: ServerLoginParam,
+
+    /// SOCKS 5 configuration.
     pub socks5_config: Option<Socks5Config>,
     pub strict_tls: bool,
 }
diff --git a/src/imap/select_folder.rs b/src/imap/select_folder.rs
index f209edff4..2d6dfa9a6 100644
--- a/src/imap/select_folder.rs
+++ b/src/imap/select_folder.rs
@@ -1,3 +1,5 @@
+//! # IMAP folder selection module.
+
 use anyhow::Context as _;
 
 use super::session::Session as ImapSession;
diff --git a/src/qr.rs b/src/qr.rs
index 982777b4a..b9ffbbad5 100644
--- a/src/qr.rs
+++ b/src/qr.rs
@@ -473,11 +473,15 @@ fn decode_webrtc_instance(_context: &Context, qr: &str) -> Result<Qr> {
 
 #[derive(Debug, Deserialize)]
 struct CreateAccountSuccessResponse {
+    /// Email address.
     email: String,
+
+    /// Password.
     password: String,
 }
 #[derive(Debug, Deserialize)]
 struct CreateAccountErrorResponse {
+    /// Reason for the failure to create account returned by the server.
     reason: String,
 }
 
diff --git a/src/tools.rs b/src/tools.rs
index 8703a124f..7e8d7e922 100644
--- a/src/tools.rs
+++ b/src/tools.rs
@@ -592,6 +592,8 @@ pub(crate) fn improve_single_line_input(input: &str) -> String {
 }
 
 pub(crate) trait IsNoneOrEmpty<T> {
+    /// Returns true if an Option does not contain a string
+    /// or contains an empty string.
     fn is_none_or_empty(&self) -> bool;
 }
 impl<T> IsNoneOrEmpty<T> for Option<T>