You can search for identifiers within the package.
in-package search v0.2.0
module Flags : sig ... end
type t = {
src : tpPort;
dst : tpPort;
seq : int32;
ack : int32;
offset : int8;
flags : Flags.t;
window : int16;
chksum : int8;
urgent : int8;
payload : bytes;
}