diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 8888c66..441d8da 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2994,13 +2994,17 @@ function template_preprocess_install_page(&$variables) {
 }
 
 /**
- * Preprocess variables for region.html.twig
+ * Prepares variables for region templates.
+ *
+ * Default template: region.html.twig.
  *
  * Prepares the values passed to the theme_region function to be passed into a
  * pluggable template engine. Uses the region name to generate a template file
- * suggestions. If none are found, the default region.html.twig is used.
+ * suggestions.
  *
- * @see region.html.twig
+ * @param array $variables
+ *  An associative array containing:
+ *    - elements: An associative array containing properties of the region.
  */
 function template_preprocess_region(&$variables) {
   // Create the $content variable that templates expect.