diff --git a/module_usb_audio/devicedefines.h b/module_usb_audio/devicedefines.h
index d79e2563..7d12bfd2 100644
--- a/module_usb_audio/devicedefines.h
+++ b/module_usb_audio/devicedefines.h
@@ -56,6 +56,7 @@
 
 #if ((MCLK_48 % MIN_FREQ) == 0)
 #define MIN_FREQ_48 MIN_FREQ
+/* * 2 required since we want the next 44.1 based freq above MIN_FREQ */
 #define MIN_FREQ_44 (((44100*512)/((48000 * 512)/MIN_FREQ))*2)
 #endif