diff --git a/readthedocs.yml b/readthedocs.yml
index 3db5256..9fa1d8d 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -18,3 +18,7 @@ python:
 
 conda:
   environment: environment.yml
+
+submodules:
+  include: all
+  recursive: true