diff --git a/README.md b/README.md
index 05cca62..75b7476 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,9 @@
 
 A bluetooth RSSI monitor to run on a tiny system such as a microcontroller or single board computer.  
 
+### Vulnerability
+
+As no formal pairing is completed, this is susceptible to MAC address spoofing, and so should only be used when paired with additional authentication factors.  
 
 ### Usage