diff --git a/.readthedocs.yml b/.readthedocs.yml
index 1c609e6..2c99ffd 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -14,6 +14,7 @@ conda:
 
 sphinx:
   builder: html
+  configuration: book/conf.py
   # fail on warning is false until i get the API doc build sorted out
   fail_on_warning: false