diff --git a/vars/default_vars.yml b/vars/default_vars.yml
index 9f0830ee3..195677283 100644
--- a/vars/default_vars.yml
+++ b/vars/default_vars.yml
@@ -90,6 +90,10 @@ iiab_home_url: /home
 # Internal Wi-Fi Access Point
 # Values are used if there is an internal Wi-Fi adapter and hostapd is enabled.
 #
+# WARNING: IF YOU CONNECT YOUR IIAB'S INTERNAL WIFI TO THE INTERNET OVER 5 GHz,
+# YOU'LL PREVENT OLDER LAPTOPS/PHONES/TABLETS (WHICH REQUIRE 2.4 GHz) FROM
+# CONNECTING TO YOUR IIAB'S INTERNAL HOTSPOT.  See "wifi_up_down: True" below.
+#
 # Raspberry Pi OS requires WiFi country -- SET THIS IN /etc/iiab/local_vars.yml
 host_country_code: US
 host_ssid: "Internet in a Box"