+.SH KEY CACHES
+Monkeysphere keeps track of keys in key cache directories. The files
+in the cache are named with the format "USERID_HASH.PUB_KEY_ID", where
+USERID_HASH is a hash of the exact OpenPGP user ID, and PUB_KEY_ID is
+the key ID of the primary key. If the user/key ID combo exists in the
+Web of Trust but is not acceptable, then the file is empty. If the
+primary key has at least one acceptable sub key, then an ssh-style
+key, converted from the OpenPGP key, of all acceptable subkeys will be
+stored in the cache file, one per line. known_hosts style key lines
+will be stored in the host_keys cache files, and authorized_keys style
+key lines will be stored in the user_keys cache files. OpenPGP keys
+are converted to ssh-style keys with the openpgp2ssh utility (see `man
+openpgp2ssh').
+.PD