diff --git a/cve_bin_tool/cli.py b/cve_bin_tool/cli.py
index 6449ea5d55..3e62a242b9 100644
--- a/cve_bin_tool/cli.py
+++ b/cve_bin_tool/cli.py
@@ -82,7 +82,10 @@
 
 
 class StringToListAction(argparse.Action):
+    """Convert comma-separated strings to lists."""
+
     def __call__(self, parser, namespace, values, option_string=None):
+        """Parse and convert comma-separated values to a list."""
         values = list(map(lambda val: val.strip(), values.split(",")))
         setattr(namespace, self.dest, values)