You can search for identifiers within the package.
in-package search v0.2.0
type storage = Bytes.t
val of_public_key : public key -> storage
val to_public_key : storage -> public key
val of_secret_key : secret key -> storage
val to_secret_key : storage -> secret key
val sign : secret key -> storage -> storage
val sign_open : public key -> storage -> storage