diff --git a/core/lib/Drupal/Core/Render/theme.api.php b/core/lib/Drupal/Core/Render/theme.api.php
index 249a4b1..3b7762d 100644
--- a/core/lib/Drupal/Core/Render/theme.api.php
+++ b/core/lib/Drupal/Core/Render/theme.api.php
@@ -614,7 +614,8 @@ function hook_preprocess_HOOK(&$variables) {
  * $variables['theme_hook_original'].
  *
  * Implementations of this hook must be placed in *.module or *.theme files, or
- * make sure that hook implementation available at any given time.
+ * must otherwise make sure that the hook implementation is available at
+ * any given time.
  *
  * @todo Add @code sample.
  *