diff --git a/core/modules/book/book.module b/core/modules/book/book.module
index 356f68b..2c6e26d 100644
--- a/core/modules/book/book.module
+++ b/core/modules/book/book.module
@@ -32,7 +32,7 @@ function book_help($route_name, RouteMatchInterface $route_match) {
$output .= '' . t('Uses') . '
';
$output .= '';
$output .= '- ' . t('Adding and managing book content') . '
';
- $output .= '- ' . t('You can assign separate permissions for creating new books as well as creating, editing and deleting book content. Users with the Administer book outlines permission can add any type of content to a book by selecting the appropriate book outline while editing the content. They can also view a list of all books, and edit and rearrange section titles on the Book administration page.', array('!admin-book' => \Drupal::url('book.admin'))) . '
';
+ $output .= '- ' . t('Books have a hierarchical structure, called a ‘book outline’. Each book outline can have nested pages up to nine levels deep. Multiple content types can be configured to behave as a book outline. From the node edit form it is possible to add a page to a book outline or create a new book.') . '
';
$output .= '- ' . t('Book navigation') . '
';
$output .= '- ' . t("Book pages have a default book-specific navigation block. This navigation block contains links that lead to the previous and next pages in the book, and to the level above the current page in the book's structure. This block can be enabled on the Blocks administration page. For book pages to show up in the book navigation, they must be added to a book outline.", array('!admin-block' => \Drupal::url('block.admin_display'))) . '
';
$output .= '- ' . t('Collaboration') . '
';