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diff --git a/web/core/lib/Drupal/Core/Extension/module.api.php b/web/core/lib/Drupal/Core/Extension/module.api.php
index 176275236..45355cc3f 100644
--- a/web/core/lib/Drupal/Core/Extension/module.api.php
+++ b/web/core/lib/Drupal/Core/Extension/module.api.php
@@ -676,9 +676,10 @@ function hook_update_N(&$sandbox) {
  * These updates are executed after all hook_update_N() implementations. At this
  * stage Drupal is already fully repaired so you can use any API as you wish.
  *
- * NAME can be arbitrary machine names. In contrast to hook_update_N() the order
- * of functions in the file is the only thing which ensures the execution order
- * of those functions.
+ * NAME can be arbitrary machine names. In contrast to hook_update_N() the
+ * alphanumeric naming of functions in the file is the only thing which ensures
+ * the execution order of those functions. If update order is mandatory,
+ * you should add numerical prefix to NAME or make it completely numerical.
  *
  * Drupal also ensures to not execute the same hook_post_update_NAME() function
  * twice.