diff --git a/benchmarks/k8s/parameter_expander.py b/benchmarks/k8s/parameter_expander.py
index 1c3b175..e9b52e7 100644
--- a/benchmarks/k8s/parameter_expander.py
+++ b/benchmarks/k8s/parameter_expander.py
@@ -1,3 +1,5 @@
+"""Simple, self-contained utility for expanding Argo Workflows parameter matrices."""
+
 import itertools
 import json
 import sys