chkrootkit gives this message, should I be worried?

[H. S.]

I am running Debian Sarge (kernel 2.4.24-1-686). I ran chkrootkit (v 
0.42b) and got this message (along with all other "nothing found" messages):

Searching for suspicious files and dirs, it may take a while...
/usr/lib/plt/collects/readline/.DS_Store
What does this mean? Should I be worried?

thanks,
->HS
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