diff --git a/handbook/computing/netconfig.html b/handbook/computing/netconfig.html
index 31edd2d4e..3912d96d1 100644
--- a/handbook/computing/netconfig.html
+++ b/handbook/computing/netconfig.html
@@ -77,6 +77,7 @@ Installing the kernel headers for the runing kernel,
 then running <tt>/home/expo/alfa-driver/morrownr/install-driver.sh NoPrompt</tt> will update it.
 <p>I recommend not updating the kernel for the duration of expo. 
 We are getting 15-30 Mbit/s download speed with this device at the Acer Aspire netbook (3 July 2023).
+  <p>Note that this dual-antenna WiFi thing is a <em>high power</em> device: it won't work if plugged in via an unpowered USB hub. It is also fussy about which USB port it is plugged into on the netbook.
   
 <h4>IP6</h4>
 <p>While you can use 5Ghz wifi and IP6 to connect within the hut (if the Netgear router is being used),