diff --git a/yubikey-ssh-pkcs11.md b/yubikey-ssh-pkcs11.md
index d455cef..e06dabd 100644
--- a/yubikey-ssh-pkcs11.md
+++ b/yubikey-ssh-pkcs11.md
@@ -1,4 +1,5 @@
 > OpenSC Official Repo: https://github.com/OpenSC/OpenSC
+> Yubikey's PKCS#11 library works too: `/usr/local/lib/libykcs11.dylib`
 
 OpenSSH can work with PKCS#11:
 ```shell