diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 80bd461..2d51cce 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -16,8 +16,7 @@ sphinx:
   configuration: docs/manual/source/conf.py
 
 # If using Sphinx, optionally build your docs in additional formats such as PDF
-# formats:
-#    - pdf
+formats: all
 
 # Optionally declare the Python requirements required to build your docs
 python: