diff --git a/core/includes/form.inc b/core/includes/form.inc
index be2b8d1..356174f 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -812,9 +812,9 @@ function form_process_select($element) {
 }
 
 /**
- * Preprocesses variables for theme_select().
+ * Prepares variables for select element templates.
  *
- * Default template: select.html.twig
+ * Default template: select.html.twig.
  *
  * It is possible to group options together; to do this, change the format of
  * $options to an associative array in which the keys are group labels, and the
diff --git a/core/modules/system/templates/select.html.twig b/core/modules/system/templates/select.html.twig
index fe7451a..21f32ac 100644
--- a/core/modules/system/templates/select.html.twig
+++ b/core/modules/system/templates/select.html.twig
@@ -3,9 +3,9 @@
  * @file
  * Default theme implementation for a select element.
  *
- * Available variables
+ * Available variables:
  * - attributes: HTML attributes for the select tag.
- * - options: HTML string of options.
+ * - options: The option element children.
  *
  * @see template_preprocess_select()
  *