diff --git a/core/modules/system/system.post_update.php b/core/modules/system/system.post_update.php
index d849106..193a14e 100644
--- a/core/modules/system/system.post_update.php
+++ b/core/modules/system/system.post_update.php
@@ -60,7 +60,7 @@ function system_post_update_add_region_to_entity_displays() {
 
 
 /**
- * Force Twig php file cache to be cleared.
+ * Force Twig PHP file cache to be cleared.
  */
 function system_post_update_clear_twig_cache() {
   // Empty post-update hook.