diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index ffa0b5d..90666a0 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -1648,6 +1648,11 @@ function system_update_8014() {
  */
 
 /**
+ * @addtogroup updates-8.1.x
+ * @{
+ */
+
+/**
  * Trigger cache rebuild.
  */
 function system_update_8015() {