Log limit

[Ticlea Alexandru]

Hello
According to user guide, the next line looks correct but it leads to a syntax 
error
log "/var/log/bird.log"  102400  "/var/log/bird.log-prev" { info, remote, 
warning, error, auth, fatal, bug };
Can we help me to understand the unit used to express the limit?
I use bird 2.0.2