diff --git a/modules/icing/pireps.py b/modules/icing/pireps.py
index 4656f1413678d170d77b8ab28b3f51f50dc8db07..d8e37b315bf9b6ff8700c16a6d83ebf5d37fba3f 100644
--- a/modules/icing/pireps.py
+++ b/modules/icing/pireps.py
@@ -54,6 +54,7 @@ def time_sort_pirep_dict(the_dict):
 
 
 # Returns icing, no_icing (no icing observed), neg-icing (icing expected, but not observed)
+# from Iowa Mesonet Archived PIREP reports delivered in csv format
 def pirep_icing(filename, lon_range=[-180, 180], lat_range=[-63, 63]):
 
     # HEADER: VALID,URGENT,AIRCRAFT,REPORT,LAT,LON