diff --git a/core/modules/language/src/Entity/ConfigurableLanguage.php b/core/modules/language/src/Entity/ConfigurableLanguage.php
index 4c458a0..d029714 100644
--- a/core/modules/language/src/Entity/ConfigurableLanguage.php
+++ b/core/modules/language/src/Entity/ConfigurableLanguage.php
@@ -124,7 +124,8 @@ public function preSave(EntityStorageInterface $storage) {
 
     // When adding a new language the weight shouldn't be zero to avoid a
     // reordering of the languages list when their names change i.e. interface
-    // translation.
+    // translation. The english language is special cased because it is provided
+    // as default configuration with a valid weight of 0.
     if ($this->id != 'en' && $this->isNew() && !$this->isLocked() && $this->getWeight() == 0) {
       // Fetch all configurable languages ordered by weight.
       $languages = \Drupal::languageManager()->getLanguages($this::STATE_CONFIGURABLE);
diff --git a/core/modules/language/src/Tests/LanguageListTest.php b/core/modules/language/src/Tests/LanguageListTest.php
index 1c9ac28..22a638f 100644
--- a/core/modules/language/src/Tests/LanguageListTest.php
+++ b/core/modules/language/src/Tests/LanguageListTest.php
@@ -48,7 +48,7 @@ function testLanguageList() {
     $this->assertUrl(\Drupal::url('entity.configurable_language.collection', [], ['absolute' => TRUE]));
 
     // Get the weight of the last language and check that the weight is one unit
-    // heavier and that is French.
+    // heavier and than the last configurable language.
     $this->rebuildContainer();
     $languages = \Drupal::service('language_manager')->getLanguages();
     $last_language = end($languages);