diff --git a/Compatible-Serial-Devices.md b/Compatible-Serial-Devices.md
index 26634ee..63aa2e0 100644
--- a/Compatible-Serial-Devices.md
+++ b/Compatible-Serial-Devices.md
@@ -3,7 +3,7 @@
 * Silabs CP2102, CP2105, ...
 * Qinheng CH340 
 
-and devices implementing the USB CDC protocol like
+and devices implementing the CDC/ACM protocol like
 * Arduino using ATmega32U4
 * Digispark using V-USB software USB
 * BBC micro:bit using ARM mbed DAPLink firmware