I was reading through a jQuery plugin and found a weird event(at lease to me) expression like following:

$(this).find('ul:first').bind('scroll.sticky', function(e) {
    //some code;
});

The question is what does ".sticky" mean? I only know the "scroll" part. I tried to search jQuery document but didn't found anything. Can you point me the right page?

Thanks a lot.

jquery events
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