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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -66,6 +66,7 @@ Flag | Meaning
 ``--with-libedit`` | Enable [libedit](https://www.thrysoee.dk/editline/) support for sftp.
 ``--with-kerberos5`` | Enable Kerberos/GSSAPI support. Both [Heimdal](https://www.h5l.org/) and [MIT](https://web.mit.edu/kerberos/) Kerberos implementations are supported.
 ``--with-selinux`` | Enable [SELinux](https://en.wikipedia.org/wiki/Security-Enhanced_Linux) support.
+``--with-security-key-builtin`` | Include built-in support for U2F/FIDO2 security keys. This requires [libfido2](https://github.com/Yubico/libfido2) be installed.
 
 ## Development