diff --git a/locales/ar-sa.toml b/locales/ar-sa.toml
index d4387d7..b1d145e 100644
--- a/locales/ar-sa.toml
+++ b/locales/ar-sa.toml
@@ -8,6 +8,7 @@ sus_alert = """تم اكتشاف مستخدم مشبوه! 🚨
 • النبذة: %{bio}
 • الموقع: %{website}
 • الملف التعريفي: %{profile}
+• السبب: %{reason}
 
 هل تريد حظر هذا المستخدم؟
 """
@@ -19,6 +20,7 @@ ban_notify = """تم حظر مستخدم ⛔
 • النبذة: %{bio}
 • الموقع: %{website}
 • الملف التعريفي: %{profile}
+• السبب: %{reason}
 """
 ban_success = "تم حظر المستخدم بنجاح ⛔"
 ban_failed = "فشل حظر المستخدم! ⚠️"
diff --git a/locales/en-us.toml b/locales/en-us.toml
index 8a57d49..45faf0c 100644
--- a/locales/en-us.toml
+++ b/locales/en-us.toml
@@ -8,6 +8,7 @@ sus_alert = """Suspicious user detected! 🚨
 • Bio: %{bio}
 • Website: %{website}
 • Profile: %{profile}
+• Reason: %{reason}
 
 Do you want to ban this user?
 """
@@ -19,6 +20,7 @@ ban_notify = """User has been banned ⛔
 • Bio: %{bio}
 • Website: %{website}
 • Profile: %{profile}
+• Reason: %{reason}
 """
 ban_success = "User has been banned successfully ⛔"
 ban_failed = "Failed to ban the user! ⚠️"
diff --git a/locales/ru-ru.toml b/locales/ru-ru.toml
index ddcc234..4f1a69c 100644
--- a/locales/ru-ru.toml
+++ b/locales/ru-ru.toml
@@ -8,6 +8,7 @@ sus_alert = """Обнаружен подозрительный пользова
 • Био: %{bio}
 • Вебсайт: %{website}
 • Профиль: %{profile}
+• Причина: %{reason}
 
 Хотите забанить этого пользователя?
 """
@@ -19,6 +20,7 @@ ban_notify = """Пользователь заблокирован ⛔
 • Био: %{bio}
 • Вебсайт: %{website}
 • Профиль: %{profile}
+• Причина: %{reason}
 """
 ban_success = "Пользователь успешно забанен ⛔"
 ban_failed = "Не удалось забанить пользователя! ⚠️"
diff --git a/src/config.rs b/src/config.rs
index 1d8baae..14584ca 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -19,13 +19,24 @@ pub(crate) const CONFIG_PATH_ENV: &str = "FORGEJO_GUARDIAN_CONFIG";
 /// Defult config path location
 pub(crate) const DEFAULT_CONFIG_PATH: &str = "/app/forgejo-guardian.toml";
 
+use std::fmt::Display;
+
 use regex::Regex;
 use serde::{de, Deserialize};
 use teloxide::types::ChatId;
+use toml::Value;
 use url::Url;
 
 use crate::telegram_bot::Lang;
 
+/// Function to create a custom error for deserialization from its string
+fn custom_de_err<'de, D>(err: impl ToString) -> D::Error
+where
+    D: de::Deserializer<'de>,
+{
+    de::Error::custom(err.to_string())
+}
+
 /// Deserialize a string into a `url::Url`
 ///
 /// This will check if the url is `http` or `https` and if it is a valid url
@@ -33,8 +44,7 @@ fn deserialize_str_url<'de, D>(deserializer: D) -> Result<Url, D::Error>
 where
     D: de::Deserializer<'de>,
 {
-    let url = Url::parse(&String::deserialize(deserializer)?)
-        .map_err(|e| de::Error::custom(e.to_string()))?;
+    let url = Url::parse(&String::deserialize(deserializer)?).map_err(custom_de_err::<'de, D>)?;
     if url.scheme() != "http" && url.scheme() != "https" {
         return Err(de::Error::custom("URL scheme must be http or https"));
     }
@@ -42,15 +52,69 @@ where
 }
 
 /// Deserialize a vector of strings into a vector of `regex::Regex`
-fn deserialize_regex_vec<'de, D>(deserializer: D) -> Result<Vec<Regex>, D::Error>
+fn deserialize_regex_reason<'de, D>(deserializer: D) -> Result<Vec<RegexReason>, D::Error>
 where
     D: de::Deserializer<'de>,
 {
-    Vec::<String>::deserialize(deserializer)?
+    let Ok(json_value) = Vec::<Value>::deserialize(deserializer) else {
+        return Err(de::Error::custom(
+            "expected an array of strings or tables with the keys `re` and optional `reason`",
+        ));
+    };
+
+    json_value
         .into_iter()
-        .map(|s| Regex::new(&s))
-        .collect::<Result<_, _>>()
-        .map_err(|e| de::Error::custom(e.to_string()))
+        .map(|value| {
+            if let Value::String(re) = value {
+                Ok(RegexReason::new(
+                    re.parse().map_err(custom_de_err::<'de, D>)?,
+                    None,
+                ))
+            } else if let Value::Table(table) = value {
+                let re = table
+                    .get("re")
+                    .map(|re| {
+                        re.as_str().map(String::from).ok_or_else(|| {
+                            <D::Error as de::Error>::custom(format!(
+                                "expected a string value for `re`, found `{re}`"
+                            ))
+                        })
+                    })
+                    .ok_or_else(|| {
+                        <D::Error as de::Error>::custom(
+                            "The table must contain a `re` key with a string value",
+                        )
+                    })??;
+                let reason = table
+                    .get("reason")
+                    .map(|reason| {
+                        reason.as_str().map(String::from).ok_or_else(|| {
+                            <D::Error as de::Error>::custom(format!(
+                                "expected a string value for `reason`, found `{reason}`"
+                            ))
+                        })
+                    })
+                    .transpose()?;
+
+                // Warn for unused keys
+                for key in table.keys() {
+                    if !["re", "reason"].contains(&key.as_str()) {
+                        tracing::warn!("Unused key `{key}` in the configuration");
+                    }
+                }
+
+                Ok(RegexReason::new(
+                    re.parse().map_err(custom_de_err::<'de, D>)?,
+                    reason,
+                ))
+            } else {
+                Err(de::Error::custom(format!(
+                    "unexpected value in the regex list, expected a string or a table with `re` \
+                     (string) and optional `reason` (string), found `{value}`"
+                )))
+            }
+        })
+        .collect()
 }
 
 /// The forgejo config of the guard
@@ -81,44 +145,53 @@ pub struct Telegram {
     pub lang:      Lang,
 }
 
+/// The regular expression with the reason
+#[derive(Debug, Clone)]
+pub struct RegexReason {
+    /// The regular expression
+    pub re:     Regex,
+    /// Optional reason
+    pub reason: Option<String>,
+}
+
 /// The expression
 #[derive(Deserialize, Debug, Default)]
 pub struct Expr {
     /// The regular expressions that the action will be performed if they are
     /// present in the username
     #[serde(default)]
-    #[serde(deserialize_with = "deserialize_regex_vec")]
-    pub usernames: Vec<Regex>,
+    #[serde(deserialize_with = "deserialize_regex_reason")]
+    pub usernames: Vec<RegexReason>,
 
     /// The regular expressions that the action will be performed if they are
     /// present in the user full_name
     #[serde(default)]
-    #[serde(deserialize_with = "deserialize_regex_vec")]
-    pub full_names: Vec<Regex>,
+    #[serde(deserialize_with = "deserialize_regex_reason")]
+    pub full_names: Vec<RegexReason>,
 
     /// The regular expressions that the action will be performed if they are
     /// present in the user biography
     #[serde(default)]
-    #[serde(deserialize_with = "deserialize_regex_vec")]
-    pub biographies: Vec<Regex>,
+    #[serde(deserialize_with = "deserialize_regex_reason")]
+    pub biographies: Vec<RegexReason>,
 
     /// The regular expressions that the action will be performed if they are
     /// present in the user email
     #[serde(default)]
-    #[serde(deserialize_with = "deserialize_regex_vec")]
-    pub emails: Vec<Regex>,
+    #[serde(deserialize_with = "deserialize_regex_reason")]
+    pub emails: Vec<RegexReason>,
 
     /// The regular expressions that the action will be performed if they are
     /// present in the user website
     #[serde(default)]
-    #[serde(deserialize_with = "deserialize_regex_vec")]
-    pub websites: Vec<Regex>,
+    #[serde(deserialize_with = "deserialize_regex_reason")]
+    pub websites: Vec<RegexReason>,
 
     /// The regular expressions that the action will be performed if they are
     /// present in the user location
     #[serde(default)]
-    #[serde(deserialize_with = "deserialize_regex_vec")]
-    pub locations: Vec<Regex>,
+    #[serde(deserialize_with = "deserialize_regex_reason")]
+    pub locations: Vec<RegexReason>,
 }
 
 /// the expressions
@@ -155,3 +228,20 @@ pub struct Config {
     #[serde(default)]
     pub expressions:    Exprs,
 }
+
+impl RegexReason {
+    /// Create a new `RegexReason` instance
+    fn new(re: Regex, reason: Option<String>) -> Self {
+        Self { re, reason }
+    }
+}
+
+impl Display for RegexReason {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.re).ok();
+        if let Some(ref reason) = self.reason {
+            write!(f, " ({reason})").ok();
+        };
+        Ok(())
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index adc4a94..9a3bc0c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -37,10 +37,12 @@ async fn try_main() -> error::GuardResult<()> {
     let cancellation_token = CancellationToken::new();
     // Suspicious users are sent and received in this channel, users who meet the
     // `alert` expressions
-    let (sus_sender, sus_receiver) = sync::mpsc::channel::<forgejo_api::ForgejoUser>(100);
+    let (sus_sender, sus_receiver) =
+        sync::mpsc::channel::<(forgejo_api::ForgejoUser, config::RegexReason)>(100);
     // Banned users (already banned) are sent and received in this channel, this
     // to alert the admins on Telegram if `ban_alert` is set to true
-    let (ban_sender, ban_receiver) = sync::mpsc::channel::<forgejo_api::ForgejoUser>(100);
+    let (ban_sender, ban_receiver) =
+        sync::mpsc::channel::<(forgejo_api::ForgejoUser, config::RegexReason)>(100);
 
     tracing::info!("The instance: {}", config.forgejo.instance);
     tracing::info!("Dry run: {}", config.dry_run);
diff --git a/src/telegram_bot/mod.rs b/src/telegram_bot/mod.rs
index b160c8d..8317277 100644
--- a/src/telegram_bot/mod.rs
+++ b/src/telegram_bot/mod.rs
@@ -28,7 +28,10 @@ use teloxide::{dispatching::UpdateFilterExt, prelude::*};
 use tokio::sync::mpsc::Receiver;
 use tokio_util::sync::CancellationToken;
 
-use crate::{config::Config, forgejo_api::ForgejoUser};
+use crate::{
+    config::{Config, RegexReason},
+    forgejo_api::ForgejoUser,
+};
 
 /// Language of the telegram bot
 #[derive(Deserialize)]
@@ -54,8 +57,8 @@ impl Lang {
 pub async fn start_bot(
     config: Arc<Config>,
     cancellation_token: CancellationToken,
-    sus_receiver: Receiver<ForgejoUser>,
-    ban_receiver: Receiver<ForgejoUser>,
+    sus_receiver: Receiver<(ForgejoUser, RegexReason)>,
+    ban_receiver: Receiver<(ForgejoUser, RegexReason)>,
 ) {
     tracing::info!("Starting the telegram bot");
 
diff --git a/src/telegram_bot/users_handler.rs b/src/telegram_bot/users_handler.rs
index ca6d32c..760a0d7 100644
--- a/src/telegram_bot/users_handler.rs
+++ b/src/telegram_bot/users_handler.rs
@@ -23,7 +23,10 @@ use teloxide::{
 use tokio::sync::mpsc::Receiver;
 use tokio_util::sync::CancellationToken;
 
-use crate::{config::Config, forgejo_api::ForgejoUser};
+use crate::{
+    config::{Config, RegexReason},
+    forgejo_api::ForgejoUser,
+};
 
 /// Create an inline keyboard of the suspicious user
 fn make_sus_inline_keyboard(sus_user: &ForgejoUser) -> InlineKeyboardMarkup {
@@ -49,7 +52,7 @@ fn not_found_if_empty(text: &str) -> Cow<'_, str> {
 }
 
 /// Generate a user details message
-fn user_details(msg: &str, user: &ForgejoUser) -> String {
+fn user_details(msg: &str, user: &ForgejoUser, re: &RegexReason) -> String {
     t!(
         msg,
         user_id = user.id,
@@ -59,6 +62,10 @@ fn user_details(msg: &str, user: &ForgejoUser) -> String {
         bio = not_found_if_empty(&user.biography),
         website = not_found_if_empty(&user.website),
         profile = user.html_url,
+        reason = re
+            .reason
+            .clone()
+            .unwrap_or_else(|| t!("words.not_found").to_string()),
     )
     .to_string()
 }
@@ -66,12 +73,13 @@ fn user_details(msg: &str, user: &ForgejoUser) -> String {
 /// Send a suspicious user alert to the admins
 pub async fn send_sus_alert(
     bot: &Bot,
+    re: &RegexReason,
     sus_user: ForgejoUser,
     config: &Config,
 ) -> ResponseResult<()> {
     let keyboard = make_sus_inline_keyboard(&sus_user);
 
-    let caption = user_details("messages.sus_alert", &sus_user);
+    let caption = user_details("messages.sus_alert", &sus_user, re);
     bot.send_photo(config.telegram.chat, InputFile::url(sus_user.avatar_url))
         .caption(caption)
         .reply_markup(keyboard)
@@ -83,10 +91,11 @@ pub async fn send_sus_alert(
 /// Send a ban notification to the admins chat
 pub async fn send_ban_notify(
     bot: &Bot,
+    re: &RegexReason,
     sus_user: ForgejoUser,
     config: &Config,
 ) -> ResponseResult<()> {
-    let caption = user_details("messages.ban_notify", &sus_user);
+    let caption = user_details("messages.ban_notify", &sus_user, re);
     bot.send_photo(config.telegram.chat, InputFile::url(sus_user.avatar_url))
         .caption(caption)
         .await?;
@@ -99,16 +108,16 @@ pub async fn users_handler(
     bot: Bot,
     config: Arc<Config>,
     cancellation_token: CancellationToken,
-    mut sus_receiver: Receiver<ForgejoUser>,
-    mut ban_receiver: Receiver<ForgejoUser>,
+    mut sus_receiver: Receiver<(ForgejoUser, RegexReason)>,
+    mut ban_receiver: Receiver<(ForgejoUser, RegexReason)>,
 ) {
     loop {
         tokio::select! {
-            Some(sus_user) = sus_receiver.recv() => {
-                send_sus_alert(&bot, sus_user, &config).await.ok();
+            Some((sus_user, re)) = sus_receiver.recv() => {
+                send_sus_alert(&bot, &re, sus_user, &config).await.ok();
             }
-            Some(banned_user) = ban_receiver.recv() => {
-                send_ban_notify(&bot, banned_user, &config).await.ok();
+            Some((banned_user, re)) = ban_receiver.recv() => {
+                send_ban_notify(&bot, &re, banned_user, &config).await.ok();
             }
             _ = cancellation_token.cancelled() => {
                 tracing::info!("sus users handler has been stopped successfully.");
diff --git a/src/traits.rs b/src/traits.rs
index 29d610c..c5fa60e 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -14,22 +14,23 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program. If not, see <https://gnu.org/licenses/agpl.txt>.
 
-use regex::Regex;
-
-use crate::{config::Expr, forgejo_api::ForgejoUser};
+use crate::{
+    config::{Expr, RegexReason},
+    forgejo_api::ForgejoUser,
+};
 
 /// Trait for checking if a user matches one of the expressions
 pub trait ExprChecker {
     /// Returns the first matching expression, if any
-    fn is_match(&self, user: &ForgejoUser) -> Option<Regex>;
+    fn is_match(&self, user: &ForgejoUser) -> Option<RegexReason>;
 }
 
 impl ExprChecker for Expr {
-    fn is_match<'a>(&'a self, user: &ForgejoUser) -> Option<Regex> {
-        let one_of = |hay: &str, exprs: &'a Vec<Regex>| {
+    fn is_match<'a>(&'a self, user: &ForgejoUser) -> Option<RegexReason> {
+        let one_of = |hay: &str, exprs: &'a Vec<RegexReason>| {
             exprs
                 .iter()
-                .find(|re| hay.split('\n').any(|line| re.is_match(line.trim())))
+                .find(|re| hay.split('\n').any(|line| re.re.is_match(line.trim())))
         };
         [
             one_of(&user.username, &self.usernames),
diff --git a/src/users_fetcher.rs b/src/users_fetcher.rs
index d61538b..7a5d8f4 100644
--- a/src/users_fetcher.rs
+++ b/src/users_fetcher.rs
@@ -26,7 +26,7 @@ use tokio::sync::mpsc::Sender;
 use tokio_util::sync::CancellationToken;
 
 use crate::{
-    config::Config,
+    config::{Config, RegexReason},
     error::GuardResult,
     forgejo_api::{self, get_users, ForgejoUser},
     traits::ExprChecker,
@@ -58,15 +58,15 @@ async fn check_new_user(
     user: ForgejoUser,
     request_client: &reqwest::Client,
     config: &Config,
-    sus_sender: &Sender<ForgejoUser>,
-    ban_sender: &Sender<ForgejoUser>,
+    sus_sender: &Sender<(ForgejoUser, RegexReason)>,
+    ban_sender: &Sender<(ForgejoUser, RegexReason)>,
 ) {
     if let Some(re) = config.expressions.ban.is_match(&user) {
         tracing::info!("@{} has been banned because `{re}`", user.username);
         if config.dry_run {
             // If it's a dry run, we don't need to ban the user
             if config.telegram.ban_alert {
-                ban_sender.send(user).await.ok();
+                ban_sender.send((user, re)).await.ok();
             }
             return;
         }
@@ -81,11 +81,11 @@ async fn check_new_user(
         {
             tracing::error!("Error while banning a user: {err}");
         } else if config.telegram.ban_alert {
-            ban_sender.send(user).await.ok();
+            ban_sender.send((user, re)).await.ok();
         }
     } else if let Some(re) = config.expressions.sus.is_match(&user) {
         tracing::info!("@{} has been suspected because `{re}`", user.username);
-        sus_sender.send(user).await.ok();
+        sus_sender.send((user, re)).await.ok();
     }
 }
 
@@ -95,8 +95,8 @@ async fn check_new_users(
     last_user_id: Arc<AtomicUsize>,
     request_client: Arc<reqwest::Client>,
     config: Arc<Config>,
-    sus_sender: Sender<ForgejoUser>,
-    ban_sender: Sender<ForgejoUser>,
+    sus_sender: Sender<(ForgejoUser, RegexReason)>,
+    ban_sender: Sender<(ForgejoUser, RegexReason)>,
 ) {
     let is_first_fetch = last_user_id.load(Ordering::Relaxed) == 0;
     match get_new_users(
@@ -135,8 +135,8 @@ async fn check_new_users(
 pub async fn users_fetcher(
     config: Arc<Config>,
     cancellation_token: CancellationToken,
-    sus_sender: Sender<ForgejoUser>,
-    ban_sender: Sender<ForgejoUser>,
+    sus_sender: Sender<(ForgejoUser, RegexReason)>,
+    ban_sender: Sender<(ForgejoUser, RegexReason)>,
 ) {
     let last_user_id = Arc::new(AtomicUsize::new(0));
     let request_client = Arc::new(reqwest::Client::new());