diff --git a/core/modules/book/book.admin.inc b/core/modules/book/book.admin.inc
index 59fa298..6d04121 100644
--- a/core/modules/book/book.admin.inc
+++ b/core/modules/book/book.admin.inc
@@ -92,7 +92,7 @@ function book_admin_settings_validate($form, &$form_state) {
  * @see book_admin_settings_validate()
  */
 function book_admin_settings_submit($form, &$form_state) {
-  // Save allowed types as indexed values (sample, 0 => book).
+  // Save allowed types as indexed values (example, 0 => book).
   $allowed_types = array_values(array_filter($form_state['values']['book_allowed_types']));
   config('book.settings')
     ->set('allowed_types', $allowed_types)