I obviously don't need merit but this is how you guys do it:
PGP: 520A E7DD 0C2F DB5C 4783 8A35 1C3D 1D19 C8E8 B6D8
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
I'm NotATether and I can sign a message.
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Version: GnuPG v2.0.22 (GNU/Linux)
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=bZsI
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Your signature might be different from mine, You're probably not going to have GNU/Linux or SHA1 in your message but it's still a valid signed message.