diff --git a/mainwindow.h b/mainwindow.h
index 5e803cd..b82156d 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -28,8 +28,8 @@ private slots:
     void zoomOut();
 
 private:
-    QString encode(const QString &input) const;
-    QString decode(const QString &input) const;
+    [[nodiscard]] QString encode(const QString &input) const;
+    [[nodiscard]] QString decode(const QString &input) const;
 
     const QMap<QChar, QString> lookUpTable1 {
                                             { 'A', ".-" },