%% You should probably cite draft-ietf-tls-tlsflags instead of this I-D.
@techreport{nir-tls-tlsflags-01,
    number =    {draft-nir-tls-tlsflags-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-nir-tls-tlsflags/01/},
    author =    {Yoav Nir},
    title =     {{A Flags Extension for TLS 1.3}},
    pagetotal = 6,
    year =      2019,
    month =     mar,
    day =       27,
    abstract =  {A number of extensions are proposed in the TLS working group that carry no interesting information except the 1-bit indication that a certain optional feature is supported. Such extensions take 4 octets each. This document defines a flags extension that can provide such indications at an average cost of 1.5 bits each. More precisely, it provides up to 64 such indications in a fixed-size, 12-octet extension.},
}