diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 7cae98f..3d4131c 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -20,8 +20,8 @@ sphinx:
    configuration: docs_sphinx/conf.py
 
 # Optionally build your docs in additional formats such as PDF and ePub
-# formats:
-#    - pdf
+formats:
+   - pdf
 #    - epub
 
 # Optional but recommended, declare the Python requirements required