diff --git a/core/lib/Drupal/Core/Language/LanguageManager.php b/core/lib/Drupal/Core/Language/LanguageManager.php
index f4804caf42d58e19c9595e2f101a840ce55c7e7d..c0177df11412dfa1e600cfe118bc792a7670b66d 100644
--- a/core/lib/Drupal/Core/Language/LanguageManager.php
+++ b/core/lib/Drupal/Core/Language/LanguageManager.php
@@ -351,12 +351,17 @@ public static function getUnitedNationsLanguageList() {
   }
 
   /**
-   * {@inheritdoc}
+   * Sets the configuration override language.
    *
    * This function is a noop since the configuration cannot be overridden by
    * language unless the Language module is enabled. That replaces the default
    * language manager with a configurable language manager.
    *
+   * @param \Drupal\Core\Language\LanguageInterface $language
+   *   The language to override configuration with.
+   *
+   * @return $this
+   *
    * @see \Drupal\language\ConfigurableLanguageManager::setConfigOverrideLanguage()
    */
   public function setConfigOverrideLanguage(LanguageInterface $language = NULL) {
diff --git a/core/modules/language/src/ConfigurableLanguageManager.php b/core/modules/language/src/ConfigurableLanguageManager.php
index de64c4423a7c87ad3d6fe58eaceff5a89be42e92..13079f85541b8bc280a7c078307608129d70a17e 100644
--- a/core/modules/language/src/ConfigurableLanguageManager.php
+++ b/core/modules/language/src/ConfigurableLanguageManager.php
@@ -426,7 +426,12 @@ public function getLanguageSwitchLinks($type, Url $url) {
   }
 
   /**
-   * {@inheritdoc}
+   * Sets the configuration override language.
+   *
+   * @param \Drupal\Core\Language\LanguageInterface $language
+   *   The language to override configuration with.
+   *
+   * @return $this
    */
   public function setConfigOverrideLanguage(LanguageInterface $language = NULL) {
     $this->configFactoryOverride->setLanguage($language);