diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 3170150b55fd587d7c76f0eb39382e751f0ccd48..fef23130fe6d6b0afb0a3d4f8c97d730f2048639 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,9 +1,14 @@
 version: 2
+
 sphinx:
   configuration: docs/conf.py
+
 build:
   image: testing
-formats: all
+
+# NOTE: only build default HTML
+# formats: all
+
 python:
   version: 3.9
   install: