diff --git a/roles/calibre/defaults/main.yml b/roles/calibre/defaults/main.yml
index f135ee6f2..73ed87fea 100644
--- a/roles/calibre/defaults/main.yml
+++ b/roles/calibre/defaults/main.yml
@@ -5,7 +5,10 @@ calibre_web_path: calibre
 # In addition to: http://box:8080 http://box/books box/libros box/livres box/livros box/liv
 
 calibre_dbpath: "{{ content_base }}/calibre"
-# i.e. /library/calibre
+# i.e. /library/calibre (holds metadata.db + book directories + our users.sqlite)
+
+calibre_userdb: "{{ calibre_dbpath }}/users.sqlite"
+# i.e. /library/calibre/users.sqlite
 
 calibre_sample_book: "Metamorphosis-jackson.epub"
 # Must be downloadable from http://download.iiab.io/packages