diff --git a/module_usb_audio/main.xc b/module_usb_audio/main.xc
index c79e16f2..7101d15a 100755
--- a/module_usb_audio/main.xc
+++ b/module_usb_audio/main.xc
@@ -160,7 +160,8 @@ on tile[XUD_TILE] : clock    clk_spd_rx                     = CLKBLK_SPDIF_RX;
 #endif
 
 #if(XUD_SERIES_SUPPORT != XUD_U_SERIES) && defined(ADAT_RX)
-/* Cannot used CLKBLK_REF for L/G-series as this is USB clock */
+/* Cannot use default clock (CLKBLK_REF) for ADAT RX since it is tied to the 
+60MHz USB clock on G/L series parts. */
 on tile[XUD_TILE] : clock    clk_adat_rx                    = CLKBLK_ADAT_RX;
 #endif