diff --git a/src/library/entry.cr b/src/library/entry.cr
index 92f4def..f329c7a 100644
--- a/src/library/entry.cr
+++ b/src/library/entry.cr
@@ -53,6 +53,7 @@ class Entry
         json.field {{str}}, @{{str.id}}
       {% end %}
         json.field "title_id", @book.id
+        json.field "title_title", @book.title
         json.field "pages" { json.number @pages }
       end
     end