diff --git a/Known-issues.md b/Known-issues.md
index 1025be8..b79c339 100644
--- a/Known-issues.md
+++ b/Known-issues.md
@@ -277,6 +277,8 @@ Note that SpiceCompanion apps are not part of the spice2x project (not forked).
 
 The official ACR112U product line from ACS has been discontinued years ago. Most of them being sold today online are poor knock-offs of ACS ACR122U. Unfortunately, some of these knock-offs are unable to properly read FeliCa cards. Please only purchase from well known resellers. You may instead want to look into DIY solutions based on cardIO HID protocol: https://rhythm-cons.wiki/other-hardware/card-readers/
 
+Official driver is [here](https://www.acs.com.hk/en/driver/3/acr122u-usb-nfc-reader/); however, Windows default driver is usually sufficient.
+
 There is also a known bug in ACR122U logic (`scard.cpp`) when reading UID values from cards. It interprets the "success" header `90 00` as part of the UID. If your card has UID of `1234 5678` then it's read as `1234 5678 9000 0000`. This is not an issue for FeliCa as they already have full 8 bytes of UID, it's only a problem for cards with UID < 8 bytes. It's recommended that you set `-scardfix fix` for more correct behavior for non-FeliCa cards.
 
 ## Other issues