diff --git a/swmmanywhere/graph_utilities.py b/swmmanywhere/graph_utilities.py
index c8ed99de..1698417c 100644
--- a/swmmanywhere/graph_utilities.py
+++ b/swmmanywhere/graph_utilities.py
@@ -426,7 +426,7 @@ def __call__(self, G: nx.Graph,
             # Derive
             subs_gdf = go.derive_subcatchments(G,temp_fid)
 
-        # RC
+        # Calculate runoff coefficient (RC)
         if addresses.building.suffix == '.parquet':
             buildings = gpd.read_parquet(addresses.building)
         else: