diff --git a/doc/index.rst b/doc/index.rst
index 314900f7..d702a42c 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -224,7 +224,10 @@ The included ``.nc`` files are PyPSA network files which can be imported with Py
     n = pypsa.Network(filename)
 
 
+Operating Systems
+=================
 
+The PyPSA-Eur workflow is continuously tested for Linux, macOS and Windows (WSL only).
 
 
 .. toctree::