diff --git a/flattr.module b/flattr.module
index 117b1b5..66038fa 100644
--- a/flattr.module
+++ b/flattr.module
@@ -153,7 +153,7 @@ function flattr_field_formatter_settings_form($field, $instance, $view_mode, $fo
       '#title' => t('Field to use for Flattr username'),
       '#default_value' => $settings['flattr_username_field'],
       '#options' => $user_fields,
-      '#description' => t('The field where the users Flattr username can be found. This will be used to set the Flattr buttons owner'),
+      '#description' => t('The field where the users Flattr username can be found, it is expected to be a field on the user entity that owns the flattered entity. This will be used to set the Flattr buttons owner'),
     ),
     'flattr_compact_button' => array(
       '#type' => 'select',