diff --git a/tools/discover_hosts.sh b/tools/discover_hosts.sh
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+++ b/tools/discover_hosts.sh
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+#!/usr/bin/env bash
+
+# **discover_hosts.sh**
+
+# This is just a very simple script to run the
+# "nova-manage cell_v2 discover_hosts" command
+# which is needed to discover compute nodes and
+# register them with a parent cell in Nova.
+# This assumes that /etc/nova/nova.conf exists
+# and has the following entries filled in:
+#
+# [api_database]
+# connection = This is the URL to the nova_api database
+#
+# In other words this should be run on the primary
+# (API) node in a multi-node setup.
+
+nova-manage cell_v2 discover_hosts --verbose