diff --git a/core/modules/language/language.module b/core/modules/language/language.module
index e2a0315..d5c238b 100644
--- a/core/modules/language/language.module
+++ b/core/modules/language/language.module
@@ -55,13 +55,15 @@ function language_help($route_name, RouteMatchInterface $route_match) {
       return $output;
 
     case 'entity.configurable_language.collection':
-      return '<p>' . t('Reorder the added languages to set their order in the language switcher block and, when editing content, in the list of selectable languages. This ordering does not impact <a href="@detection">detection and selection</a>.', array('@detection' => \Drupal::url('language.negotiation'))) . '</p>';
+      $output = '<p>' . t('Reorder the added languages to set their order in the language switcher block and, when editing content, in the list of selectable languages. This ordering does not impact <a href="@detection">detection and selection</a>.', array('@detection' => \Drupal::url('language.negotiation'))) . '</p>';
+      $output .= '<p>' . t('The site default language can also be set. It is not recommended to change the default language on a working site. <a href="@language-detection">Configure the Selected language</a> setting on the detection and selection page to change the fallback language for language selection.', array('@language-detection' => \Drupal::url('language.negotiation'))) . '</p>';
+      return $output;
 
     case 'language.add':
       return '<p>' . t('Add a language to be supported by your site. If your desired language is not available, pick <em>Custom language...</em> at the end and provide a language code and other details manually.') . '</p>';
 
     case 'language.negotiation':
-      $output = '<p>' . t('Define how to decide which language is used to display page elements (primarily text provided by modules, such as field labels and help text). This decision is made by evaluating a series of detection methods for languages; the first detection method that gets a result will determine which language is used for that type of text. Be aware that some language negotiation methods are unreliable under certain conditions, such as browser detection when page-caching is enabled and a user is not currently logged in. Define the order of evaluation of language detection methods on this page. The default language can be changed at the <a href="!region-settings">Regional settings</a> page.', array('!region-settings' => \Drupal::url('system.regional_settings'))) . '</p>';
+      $output = '<p>' . t('Define how to decide which language is used to display page elements (primarily text provided by modules, such as field labels and help text). This decision is made by evaluating a series of detection methods for languages; the first detection method that gets a result will determine which language is used for that type of text. Be aware that some language negotiation methods are unreliable under certain conditions, such as browser detection when page-caching is enabled and a user is not currently logged in. Define the order of evaluation of language detection methods on this page. The default language can be changed in the <a href="!admin-change-language">list of languages</a>.', array('!admin-change-language' => \Drupal::url('entity.configurable_language.collection'))) . '</p>';
       return $output;
 
     case 'language.negotiation_session':