diff --git a/.readthedocs.yml b/.readthedocs.yml
index 7380a941..e0f95d1e 100755
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -26,3 +26,7 @@ sphinx:
 
 conda:
   environment: docs/environment.yml
+
+formats:
+  - pdf
+  - epub