diff --git a/Asus-Xonar-AE.md b/Asus-Xonar-AE.md
index c592813..56066f5 100644
--- a/Asus-Xonar-AE.md
+++ b/Asus-Xonar-AE.md
@@ -22,6 +22,8 @@ While the card works great for ASIO, it's actually **not** good for other games
 
 You will also not be able to directly capture audio when ASIO is in use. You are able to adjust Windows audio volume, however.
 
+Do not buy this card if you must use SPDIF (optical out) - it won't work properly with IIDX/SDVX.
+
 Lastly, do not purchase other products in the Xonar line thinking they will work similarly; they will not, as they use completely different chipsets or have different set of output channels! Do not buy Xonar DG, Xonar SE, or Xonar DSX and expect it to work exactly the same as the AE.
 
 ### Known Alternatives to Xonar AE