docs: Add presentation language to `KDFLabel`.
@@ -2,6 +2,15 @@ use super::*;
/// `KdfLabel` is later serialized and used in the `label` field of
/// `kdf_expand_label`.
+///
+/// ```c
+/// // draft-ietf-mls-protocol-16
+/// struct {
+/// uint16 length = Length;
+/// opaque label<V> = "MLS 1.0 " + Label;
+/// opaque context<V> = Context;
+/// } KDFLabel;
+/// ```
#[derive(TlsSerialize, TlsSize)]
pub(in crate::ciphersuite) struct KdfLabel {
length: u16,
