diff --git a/ingest/bin/post_process_metadata.py b/ingest/bin/post_process_metadata.py
index 1c95ef6c..678b7850 100755
--- a/ingest/bin/post_process_metadata.py
+++ b/ingest/bin/post_process_metadata.py
@@ -51,7 +51,10 @@ def _set_paper_url(record):
     if pd.isna(record["publications"]):
         return ""
 
-    return "https://www.ncbi.nlm.nih.gov/pubmed/" + str(record["publications"]).split(",")[0]
+    return (
+        "https://www.ncbi.nlm.nih.gov/pubmed/"
+        + str(record["publications"]).split(",")[0]
+    )
 
 
 def _set_dengue_serotype(record):
@@ -72,12 +75,10 @@ def _set_dengue_serotype(record):
     return ""
 
 
-# === Main Method
 def main():
     args = parse_args()
     df = pd.read_csv(args.metadata, sep="\t", header=0)
 
-    # Mutate commands
     df["strain"] = df.apply(_set_strain_name, axis=1)
     df["url"] = df.apply(_set_url, axis=1)
     df["paper_url"] = df.apply(_set_paper_url, axis=1)
@@ -85,7 +86,6 @@ def main():
     df["authors"] = df["abbr_authors"]
     df["city"] = df["location"]
 
-    # Format output
     METADATA_COLUMNS = [
         "strain",
         "accession",