diff --git a/pvlib/modelchain.py b/pvlib/modelchain.py
index 58ddd52b93..340c7d8598 100644
--- a/pvlib/modelchain.py
+++ b/pvlib/modelchain.py
@@ -582,9 +582,10 @@ def with_pvwatts(cls, system, location,
             constructor and take precedence over the default
             configuration.
 
-        .. warning::
-            The PVWatts model assumes 14% total system losses. The loss assumptions
-            can be modified as shown in the example below.
+        Warning
+        -------
+        The PVWatts model assumes 14% total system losses. The loss assumptions
+        can be modified as shown in the example below.
 
         Examples
         --------