-interpreted. This option is necessary because old SPSS system files
-do not self-identify their encoding.
+interpreted. This option is necessary because old SPSS system files,
+and SPSS/PC+ system files, do not self-identify their encoding.
+
+@item -p @var{password}
+@item --password=@var{password}
+Specifies the password to use to decrypt an encrypted SPSS system file
+or syntax file. If this option is not specified,
+@command{pspp-convert} will prompt interactively for the password as
+necessary.
+
+Be aware that command-line options, including passwords, may be
+visible to other users on multiuser systems.