Indeedy. Bear in mind the mods have power to edit or remove your signature at any time if you are deemed to use the fora mainly for self-promotion without actually taking part in the forum community. It's a guideline more of a rule, but if you make 5 redundant posts just so's you can add a signature promoting your site, service, or product, and then scuttle off into the horizon with the sound of great SEO ringing in your ears, it will most likely be removed before The Googles can even say 'let's index that shit, yo'.
A hater he came and sat by a ditch,
And he took an old cracked lute;
And he sang a song which was more of a screech
'Gainst a woman that was a brute.