add comments to describe purpose of tool
diff --git a/planetstack/tools/openstack-healthcheck.py b/planetstack/tools/openstack-healthcheck.py
index 7163c7c..63534c8 100755
--- a/planetstack/tools/openstack-healthcheck.py
+++ b/planetstack/tools/openstack-healthcheck.py
@@ -1,4 +1,11 @@
#! /usr/bin/python
+
+"""
+ Check the status of libvirt, openstack-nova-compute, and
+ quantum-openvswitch-agent. If these services are enabled and have failed,
+ then restart them.
+"""
+
import os
import sys
import subprocess