diff --git a/doc/source/administration/general.rst b/doc/source/administration/general.rst
index 55d7aadb4690c09b2a48d783e84213c89ff90e7c..e33e4bc757465e61deb67300c6495713d4240ba3 100644
--- a/doc/source/administration/general.rst
+++ b/doc/source/administration/general.rst
@@ -71,3 +71,8 @@ Note that this will run on the seed, seed hypervisor, and overcloud hosts. If
 any of these hosts are not expected to be active (e.g. prior to overcloud
 deployment), the set of target hosts may be limited using the ``--limit``
 argument.
+
+These checks will attempt to ping the external IP address ``8.8.8.8`` and
+external hostname ``google.com``. They can be configured with the
+``nc_external_ip`` and ``nc_external_hostname`` variables in
+``$KAYOBE_CONFIG_PATH/networks.yml``.
diff --git a/etc/kayobe/networks.yml b/etc/kayobe/networks.yml
index eabe52eb3a5dbe1599c4a77abed6352d580f8208..904311677ca50ceaf741b7ba6d3a80551ba76fe3 100644
--- a/etc/kayobe/networks.yml
+++ b/etc/kayobe/networks.yml
@@ -196,6 +196,15 @@
 # 'name' items. These tables will be added to /etc/iproute2/rt_tables.
 #network_route_tables:
 
+###############################################################################
+# Network connectivity check configuration.
+
+# External IP address to check. Default is 8.8.8.8.
+#nc_external_ip:
+
+# External hostname to check. Default is google.com.
+#nc_external_hostname:
+
 ###############################################################################
 # Dummy variable to allow Ansible to accept this file.
 workaround_ansible_issue_8743: yes