diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 2f5f4ac..c994784 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -11,6 +11,10 @@ sphinx:
 
 formats: all
 
+python:
+  install:
+    - requirements: doc/OnlineDocs/requirements.txt
+
 # Set the version of Python and requirements required to build the docs
 #python:
 #  version: 3
diff --git a/doc/OnlineDocs/requirements.txt b/doc/OnlineDocs/requirements.txt
new file mode 100644
index 0000000..fbb128e
--- /dev/null
+++ b/doc/OnlineDocs/requirements.txt
@@ -0,0 +1 @@
+sphinx-rtd-theme