diff --git a/vars/local_vars_medium.yml b/vars/local_vars_medium.yml
index 9f619aa84..16e9faff4 100644
--- a/vars/local_vars_medium.yml
+++ b/vars/local_vars_medium.yml
@@ -39,6 +39,10 @@ iiab_domain: lan
 iiab_home_url: /home
 # You might also want to set captiveportal_splash_page (below!)
 
+# WARNING: If you connect your IIAB's internal WiFi to the Internet over 5 GHz,
+# you'll end up preventing older laptops/phones/tablets (which require 2.4 GHz)
+# from connecting to your IIAB's internal hotspot!  BAD IDEA (:
+#
 # Raspbian requires Wi-Fi country since March 2018.  Please set it here:
 host_country_code: US
 host_ssid: "Internet in a Box"