diff --git a/model_data/app.py b/model_data/app.py
index a90d5a46..6f8209d5 100644
--- a/model_data/app.py
+++ b/model_data/app.py
@@ -162,3 +162,8 @@ def handler():
     hotwater = pd.DataFrame([{"address1": p.address1, **p.hotwater} for p in input_properties])
 
     mainheating[["address1", "postcode"]]
+
+    # TODO: I want to knwo what "Good" efficiency means for the description
+    #  'Flat 28, 22 Adelina Grove' 'Solid brick, as built, insulated (assumed)'
+    #    so to do this, filter on the local authority code and property type, where we have U
+    #   values for the wall and take a median!