You can search for identifiers within the package.
in-package search v0.2.0
module Reader : Ring.READABLE
module Writer : Ring.WRITABLE
val write : Cstruct.t -> string -> int -> int -> int
val read : Cstruct.t -> string -> int -> int -> int
val unsafe_write : Cstruct.t -> string -> int -> int -> int
val unsafe_read : Cstruct.t -> string -> int -> int -> int