diff --git a/yubikey-ssh-pkcs11.md b/yubikey-ssh-pkcs11.md
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+
+```shell
+ssh-keygen -D /Library/OpenSC/lib/opensc-pkcs11.so
+ssh -I /Library/OpenSC/lib/opensc-pkcs11.so root@example.com
+```
+
+
+# Reference
+1. https://github.com/tpm2-software/tpm2-pkcs11/blob/master/docs/SSH.md
+1. https://github.com/ThomasHabets/simple-tpm-pk11
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