diff --git a/src/controllers/conversations_controller.rs b/src/controllers/conversations_controller.rs
index 6c35eb2..7f4ec80 100644
--- a/src/controllers/conversations_controller.rs
+++ b/src/controllers/conversations_controller.rs
@@ -172,10 +172,10 @@ pub fn refresh_list(r: &mut HttpRequestHandler) -> RequestResult {
                 r.forbidden(format!("Your do not belongs to conversation {} !", conv_id))?;
             }
 
-            let msgs_conv = conversations_helper::get_last_messages(conv_id as u64, 10)?;
-            list.insert(conv_id as u64, msgs_conv);
+            let list_conv = conversations_helper::get_last_messages(conv_id as u64, 10)?;
+            list.insert(conv_id as u64, list_conv);
 
-            //TODO : mark user seen
+            conversations_helper::mark_user_seen(conv_id as u64, r.user_id()?)?;
         }
 
         // TODO : Check for refresh of already initialized conversations
diff --git a/src/helpers/conversations_helper.rs b/src/helpers/conversations_helper.rs
index 10c5dfc..9c70078 100644
--- a/src/helpers/conversations_helper.rs
+++ b/src/helpers/conversations_helper.rs
@@ -2,15 +2,15 @@
 //!
 //! @author Pierre Hubert
 
-use crate::constants::database_tables_names::{CONV_LIST_TABLE, CONV_USERS_TABLE, CONV_MESSAGES_TABLE};
+use crate::constants::database_tables_names::{CONV_LIST_TABLE, CONV_MESSAGES_TABLE, CONV_USERS_TABLE};
 use crate::data::conversation::Conversation;
+use crate::data::conversation_message::ConversationMessage;
 use crate::data::error::{ExecError, ResultBoxError};
 use crate::data::new_conversation::NewConversation;
 use crate::data::user::UserID;
-use crate::helpers::database::InsertQuery;
 use crate::helpers::database;
+use crate::helpers::database::InsertQuery;
 use crate::utils::date_utils::time;
-use crate::data::conversation_message::ConversationMessage;
 
 /// Create a new conversation. This method returns the ID of the created conversation
 pub fn create(conv: &NewConversation) -> ResultBoxError<u64> {
@@ -197,7 +197,7 @@ pub fn find_private(user_1: UserID, user_2: UserID) -> ResultBoxError<Vec<u64>>
         .cond_user_id("t2.user_id", user_2)
         .set_custom_where(format!("(SELECT COUNT(*) FROM {} WHERE conv_id = t1.conv_id) = 2", CONV_USERS_TABLE).as_ref())
         .add_field("t1.conv_id AS conv_id")
-        .exec(|f|f.get_u64("conv_id"))
+        .exec(|f| f.get_u64("conv_id"))
 }
 
 /// Get the last messages posted in a conversation
@@ -208,11 +208,21 @@ pub fn get_last_messages(conv_id: u64, number_of_messages: u64) -> ResultBoxErro
         .set_order("id DESC")
         .exec(db_to_conversation_message)
         .map(|mut l| {
-            l.sort_by(|a,b| a.id.partial_cmp(&b.id).unwrap());
+            l.sort_by(|a, b| a.id.partial_cmp(&b.id).unwrap());
             l
         })
 }
 
+/// Indicate that a user has seen the last messages of a conversation
+pub fn mark_user_seen(conv_id: u64, user_id: UserID) -> ResultBoxError<()> {
+    database::UpdateInfo::new(CONV_USERS_TABLE)
+        .cond_u64("conv_id", conv_id)
+        .cond_user_id("user_id", user_id)
+        .cond_legacy_bool("saw_last_message", false)
+        .set_legacy_bool("saw_last_message", true)
+        .exec()
+}
+
 /// Turn a database entry into a ConversationInfo object
 fn db_to_conversation_info(row: &database::RowResult) -> ResultBoxError<Conversation> {
     let conv_id = row.get_u64("id")?;
@@ -238,6 +248,6 @@ fn db_to_conversation_message(row: &database::RowResult) -> ResultBoxError<Conve
         conv_id: row.get_u64("conv_id")?,
         user_id: row.get_user_id("user_id")?,
         message: row.get_optional_str("message")?,
-        image_path: row.get_optional_str("image_path")?
+        image_path: row.get_optional_str("image_path")?,
     })
 }
\ No newline at end of file
diff --git a/src/helpers/database.rs b/src/helpers/database.rs
index a194279..d370e59 100644
--- a/src/helpers/database.rs
+++ b/src/helpers/database.rs
@@ -1,15 +1,15 @@
 use std::collections;
+use std::collections::HashMap;
 use std::error::Error;
 use std::ops::Add;
 use std::sync::{Arc, Mutex};
 
+use chrono::{TimeZone, Utc};
 use mysql::{Binary, Pool, ResultSet, Value};
 use mysql::prelude::Queryable;
 
 use crate::data::config::DatabaseConfig;
 use crate::data::error::{ExecError, ResultBoxError};
-use std::collections::HashMap;
-use chrono::{Utc, TimeZone};
 use crate::data::user::UserID;
 
 /// Database access helper
@@ -595,6 +595,17 @@ impl UpdateInfo {
         self
     }
 
+    /// Filter with a legacy boolean
+    pub fn cond_legacy_bool(mut self, name: &str, val: bool) -> UpdateInfo {
+        let num = match val {
+            true => 1,
+            false => 0
+        };
+
+        self.cond.insert(name.to_string(), Value::Int(num));
+        self
+    }
+
     /// Set an new optional string
     ///
     /// None => Empty string