diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index b3423e0..3453158 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,5 +1,8 @@
 version: 2
 
+formats:
+  - pdf
+
 sphinx:
   configuration: docs/conf.py