diff --git a/tools/add_client.py b/tools/add_client.py
index b1dc8f3..36df12c 100644
--- a/tools/add_client.py
+++ b/tools/add_client.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python
+# Python helper tool to add IPtables rule using the iptc library. This must
+# of course run as root for iptc to work.
 
 from argparse import ArgumentParser
 from pprint import pprint as pp