Add spam doc

Signed-off-by: Stéphane Depierrepont <toorop@toorop.fr>
Spam

Signed-off-by: Stéphane Depierrepont <toorop@toorop.fr>
Cosmetic

Signed-off-by: Stéphane Depierrepont <toorop@toorop.fr>
add TAB const

Signed-off-by: Stéphane Depierrepont <toorop@toorop.fr>