diff --git a/scripts/dev/update_3rdparty.py b/scripts/dev/update_3rdparty.py
index f53135a99..1455a7603 100755
--- a/scripts/dev/update_3rdparty.py
+++ b/scripts/dev/update_3rdparty.py
@@ -82,6 +82,7 @@ def update_pdfjs(target_version=None):
 
 
 def main():
+    """Update 3rd party modules."""
     parser = argparse.ArgumentParser()
     parser.add_argument(
         '--pdfjs', '-p',