Added a comment explaining why we need this option

Author: javiereguiluz

src/Form/Type/DateTimePickerType.php

@@ -51,6 +51,8 @@ public function configureOptions(OptionsResolver $resolver)
     {
         $resolver->setDefaults([
             'widget' => 'single_text',
+            // if true, the browser will display the native date picker widget
+            // however, this app uses a custom JavaScript widget, so it must be set to false
             'html5' => false,
         ]);
     }