diff --git a/README.md b/README.md
index 5045fc1..b2a06bc 100644
--- a/README.md
+++ b/README.md
@@ -7,5 +7,5 @@ ServoBlaster:  A kernel driver that lets you control 8 (or more) servos from you
 
 Panalyzer:     A Pi based Logic Analyzer.  This can be found in a separate repository alongside this one, but is mentioned here for completeness.
 
-PiFmDma:       A Version of the FM Transmitter software that uses DMA for improved quality and much reduced CPU load.
+PiFmDma:       A Version of the FM Transmitter software that uses DMA for improved quality and much reduced CPU load.  NOTE: Do not use this code unless you understand what it does, what FM frequencies it might interfere with, what is and is not legal in your country, etc.