Add rbl list to spamassassin 3.0.4 ?

[Noc Phibee]

Hi
For add a new personnal rbl list, i can use:

into /etc/mail/spamassassin/
i add a 99_Private_Rbl
and into i put:

uridnsbl      PRIVATE_RBL       sbl.spamhaus.org.       TXT
body          PRIVATE_RBL       eval:check_uridnsbl('PRIVATE_RBL')
describe     PRIVATE_RBL       Contains an URL listed in the Private Rbl 
blocklist
tflags          PRIVATE_RBL       net
score          PRIVATE_RBL       0 1.094 0 1.639


it's correct ?
Why in score, i have 0 1.094 0 1.639 ?
if i want a score to 3 when the ip are listed, what is the correct score 
line ?

Thanks for your help