diff --git a/model_data/recommendations/WallRecommendations.py b/model_data/recommendations/WallRecommendations.py
index b50a3646..c447288d 100644
--- a/model_data/recommendations/WallRecommendations.py
+++ b/model_data/recommendations/WallRecommendations.py
@@ -256,6 +256,10 @@ class WallRecommendations(BaseUtility):
             if self.property.walls["thermal_transmittance_unit"] != self.U_VALUE_UNIT:
                 raise NotImplementedError("Haven't handled the case of other u value units yet")
 
+            # TODO: It's worth thinking about this logic because depending on when properties were built,
+            #       they're likely to be of a certain standard. E.g. properties built within a certain time
+            #       period are likely to have cavity walls
+
             if (not is_cavity_wall) and (self.year_built >= self.YEAR_WALLS_BUILT_WITH_INSULATION) and (
                 u_value >= self.BUILDING_REGULATIONS_PART_L_MAX_U_VALUE
             ):