diff --git a/roles/mosquitto/README.rst b/roles/mosquitto/README.rst
index 31641c045..fdd78f818 100644
--- a/roles/mosquitto/README.rst
+++ b/roles/mosquitto/README.rst
@@ -7,7 +7,12 @@ Adds the `Mosquitto <https://mosquitto.org/>`_ (`MQTT <https://mqtt.org/faq>`_)
 Roughly follows this guide: https://www.digitalocean.com/community/tutorials/how-to-install-and-secure-the-mosquitto-mqtt-messaging-broker-on-ubuntu-16-04
 
 Using It
--------
+--------
+
+Prior to installing IIAB, make sure your `/etc/iiab/local_vars.yml <http://wiki.laptop.org/go/IIAB/FAQ#What_is_local_vars.yml_and_how_do_I_customize_it.3F>`_ contains::
+
+  mosquitto_install: True
+  mosquitto_enabled: True
 
 The Mosquitto service is authenticated with: