I don't think you can do that. You can add text to the spoiler though.
Code:
[spoiler=Your Text Here]stuff inside[/spoiler]
yields
Your Text Here
stuff inside
[quote=PsiGuard]I don't think you can do that. You can add text to the spoiler though.
[code][spoiler=Your Text Here]stuff inside[/spoiler][/code]
yields
[spoiler=Your Text Here]stuff inside[/spoiler][/quote]
<Retired Admin>
Thanks to Nyoike for the sig!