diff --git a/vars/local_vars_big.yml b/vars/local_vars_big.yml
index be4b30e08..1d5e42136 100644
--- a/vars/local_vars_big.yml
+++ b/vars/local_vars_big.yml
@@ -242,6 +242,9 @@ calibre_port: 8080
 calibre_web_path: calibre  #NEEDS WORK: https://github.com/iiab/iiab/issues/529
 # In addition to: http://box/books box/libros box/livres box/livros box/liv
 
+# WARNING: Calibre-Web (below) depends on Calibre's own /usr/bin/ebook-convert
+# program, so we recommend you install Calibre (above) too!
+
 # Calibre-Web alternative to Calibre, offers a clean/modern UX
 calibreweb_install: True
 calibreweb_enabled: True