diff --git a/RestControllers/conversationsController.php b/RestControllers/conversationsController.php
index 27c2280..f23049a 100644
--- a/RestControllers/conversationsController.php
+++ b/RestControllers/conversationsController.php
@@ -306,6 +306,9 @@ class conversationsController{
 				
 				//Then we can get the ten last messages of the conversation system
 				$conversationsMessages["conversation-".$conversationID] = CS::get()->components->conversations->getLastMessages($conversationID, 10);
+
+				//Specify that user has seen last messages
+				CS::get()->components->conversations->markUserAsRead(userID, $conversationID);
 			}
 		}
 
@@ -329,11 +332,11 @@ class conversationsController{
 
 				//Check if conversation number is valid
 				if($conversationID < 1)
-					Rest_fatal_error(401, "An error occured while trying to extract given conversation ID to refresh :".$conversationID);
+					Rest_fatal_error(401, "An error occured while trying to extract given conversation ID to refresh: ".$conversationID);
 				
 				//Check if informations where given about the limit of the informations to get
 				if(!isset($informations["last_message_id"]))
-					Rest_fatal_error(401, "Conversation ".$conversationID." couldn't be refreshed: not enough informations");
+					Rest_fatal_error(401, "Conversation ".$conversationID." couldn't be refreshed: not enough informations !");
 				$last_message_id = toInt($informations["last_message_id"]);
 
 				//Check if the user belongs to the conversation
@@ -342,6 +345,9 @@ class conversationsController{
 				
 				//Then we can get informations about the conversation
 				$conversationsMessages["conversation-".$conversationID] = CS::get()->components->conversations->getNewMessages($conversationID, $last_message_id);
+
+				//Specify that user has seen last messages
+				CS::get()->components->conversations->markUserAsRead(userID, $conversationID);
 			}
 		}
 
diff --git a/classes/components/conversations.php b/classes/components/conversations.php
index b40a5b9..9d77cc2 100644
--- a/classes/components/conversations.php
+++ b/classes/components/conversations.php
@@ -509,6 +509,36 @@ class conversations {
 		return true;
 	}
 
+	/**
+	 * Mark the user of a conversation as "read" for a conversation
+	 *
+	 * @param Integer $userID The ID of the user to update
+	 * @param Integer $conversationID The ID of a conversation to update
+	 * @return Boolean True for a success
+	 */
+	public function markUserAsRead($userID, $conversationID) : bool {
+
+		//Prepare database request
+		$tableName = $this->conversationsUsersTable;
+		$conditions = "ID_".$this->conversationsListTable." = ? AND ID_utilisateurs = ?";
+		$condVals = array(
+			$conversationID,
+			$userID
+		);
+
+		//Define new values
+		$newValues = array(
+			"saw_last_message" => 1
+		);
+
+		//Try to perform a request on the database
+		if(!CS::get()->db->updateDB($tableName, $conditions, $newValues, $condVals))
+			return false; //An error occured
+
+		//Success
+		return true;
+	}
+
 	/**
 	 * Send a new message
 	 *