diff --git a/.readthedocs.yml b/.readthedocs.yml
index 680a0e3b5..711298232 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,4 +1,8 @@
 version: 2
+
+formats:
+  - pdf
+
 python:
   version: 3
   install: