Syntax for pgp --encrypt --sign

Hi,

We use pgp command line v10.0.

The bank we deal with would need to validate signature when receiving our encryted file (e.g. test1.txt.pgp).

The file is rejected with message "Reason Description: The file was received without signature."

how do I to add signature when performing pgp --encrypt ?  (if you have samples)

the command I used:

pgp --encrypt "E:\temp\test1.txt" --recipient "Wells Fargo - PGP"  --home-dir "C:\Program Files\PGP Corporation\PGP Command Line"

please help,

thanks,

-Gene