[hsflinux] message from the kernel

[gianmario]

Hi forum! The driver for my hsf modem works very well, and ppp connection to 
my ISP is also good. Only one question: typing # tail -f /var/log/messages 
while i'm connected i get some information that i can't understand:
localhost modprobe: Can't locate module ppp-compress-21
localhost kernel  : ppp Deflate Compression module registered
localhost modprobe: Can't locate module ppp-compress-21
What's meaning? Someone can help me? 
Thank you!