diff --git a/newrelic/README.md b/newrelic/README.md
index 035b41ff..ed7d2282 100644
--- a/newrelic/README.md
+++ b/newrelic/README.md
@@ -137,6 +137,17 @@ spec:
 
 The daemonset instructs Kubernetes to spawn pods on each node, mapping /dev/, /run/, /sys/, and /var/log to the container. It also maps the secrets we set up earlier to /etc/kube-newrelic/config, and sources them in the startup script, configuring the agent properly.
 
+#### DaemonSet customization
+
+- To include a custom hostname prefix (or other per-container environment variables that can be generated at run-time), you can modify the DaemonSet `command` value:
+
+```
+command: [ "bash", "-c", "source /etc/kube-newrelic/config && export NRSYSMOND_hostname=mycluster-$(hostname) && /usr/sbin/nrsysmond -E -F" ]
+```
+
+When the New Relic agent starts, `NRSYSMOND_hostname` is set using the output of `hostname` with `mycluster` prepended.
+
+
 ### Known issues
 
 It's a bit cludgy to define the environment variables like we do here in these config files. There is [another issue](https://github.com/kubernetes/kubernetes/issues/4710) to discuss adding mapping secrets to environment variables in Kubernetes.