Our client's @ref{Verifier}.
@item -key
-Path to the file with the passphrase. See @ref{Verifier} for
-how to enter passphrase from stdin silently and store it in the file.
+Path to the file with the passphrase. If omitted, then you will be asked
+to enter it in the terminal.
@item -timeout
@ref{Timeout} setting in seconds.