SHA1 - howto remove?

[paul@pinnacle.net.uk]

Hi,
	Using gnupg to sign a .txt file I get the text below at the beginning of the signed file. 
How can I get rid of the SHA1 line?

Im not currently subscribed so could you cc any replies to this email address.

Thanks

Paul


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Blah blah