diff --git a/doc/source/administration/general.rst b/doc/source/administration/general.rst
index 55d7aadb4..e33e4bc75 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 eabe52eb3..904311677 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