diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index ce6efd4..328a42a 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -19,9 +19,9 @@ build:
 sphinx:
    configuration: docs/conf.py
 
-# If using Sphinx, optionally build your docs in additional formats such as PDF
-# formats:
-#    - pdf
+If using Sphinx, optionally build your docs in additional formats such as PDF
+formats:
+   - pdf
 
 # Optionally declare the Python requirements required to build your docs
 # python: