How to create self-signed certificate with custom extension?

[ta...@appscode.com]

HI,

I am trying to create a self-signed certificate with some custom data encoded as a custom extension. From the x509 doc, https://golang.org/pkg/crypto/x509/#CreateCertificate

"CreateCertificate creates a new certificate based on a template. The following members of template are used: SerialNumber, Subject, NotBefore, NotAfter, KeyUsage, ExtKeyUsage, UnknownExtKeyUsage, BasicConstraintsValid, IsCA, MaxPathLen, SubjectKeyId, DNSNames, PermittedDNSDomainsCritical, PermittedDNSDomains, SignatureAlgorithm."

Does that mean that any custom extension included in template will not be included in the generated cert?

Thanks.