-"option is set, only the key(s) in this keyring or only the key with this "
-"fingerprint is used for the &apt-secure; verification of this repository. "
-"Otherwise all keys in the trusted keyrings are considered valid signers for "
-"this repository."
+"option is set, only the key(s) in this keyring or only the keys with these "
+"fingerprints are used for the &apt-secure; verification of this repository. "
+"Defaults to the value of the option with the same name if set in the "
+"previously acquired <filename>Release</filename> file. Otherwise all keys "
+"in the trusted keyrings are considered valid signers for this repository."