diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 4a1c963..fbbf81a 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -124,8 +124,8 @@ function drupal_theme_initialize() {
  * @param \Drupal\Core\Extension\Extension $theme
  *   The theme extension object.
  * @param \Drupal\Core\Extension\Extension[] $base_theme
- *    An optional array of objects that represent the 'base' if the
- *    theme is meant to be derivative of another theme. It requires
+ *    An optional array of objects that represents the list of 'base' themes if
+ *    the theme is meant to be derivative of another theme. It requires
  *    the same information as the $theme object. It should be in
  *    'oldest first' order, meaning the top level of the chain will
  *    be first.