diff --git a/las_outputs.py b/las_outputs.py
index 740e990..11cf21d 100644
--- a/las_outputs.py
+++ b/las_outputs.py
@@ -137,6 +137,7 @@ def calculate_volumes(profile_name, survey_date, csv_output_dir, ch_limits, volu
     try:
         volumes = pd.read_csv(csv_vol, index_col=0)
     except FileNotFoundError:
+        # Create new dataframe if csv does not exist
         volumes = pd.DataFrame()
 
     for current_date in profiles.columns: