diff --git a/infra/tools/wycheproof/launcher.py b/infra/tools/wycheproof/launcher.py
index a5f22235a..2b73c3ef3 100644
--- a/infra/tools/wycheproof/launcher.py
+++ b/infra/tools/wycheproof/launcher.py
@@ -22,12 +22,13 @@ import subprocess
 
 
 def main():
+  """Runs whycheproof."""
   if len(sys.argv) < 3:
     logging.error('Usage: %s <test_app> <testcase>.', sys.argv[0])
     return 1
 
   test_app = sys.argv[1]
-  return subprocess.run([test_app], check=False).return_code
+  return subprocess.run([test_app], check=False).returncode
 
 
 if __name__ == '__main__':
diff --git a/infra/tools/wycheproof/run.py b/infra/tools/wycheproof/run.py
index 92d576400..e14fc27c3 100644
--- a/infra/tools/wycheproof/run.py
+++ b/infra/tools/wycheproof/run.py
@@ -22,6 +22,7 @@ import sys
 
 
 def get_args():
+  """Returns parsed program arguments."""
   parser = argparse.ArgumentParser()
   parser.add_argument(
       '--input_dir',
@@ -35,6 +36,7 @@ def get_args():
 
 
 def main():
+  """Generates a dummy testcase for use by a ClusterFuzz blackbox fuzzer."""
   args = get_args()
   if not os.path.exists(args.output_dir):
     os.mkdir(args.output_dir)