What does a line next to a note on guitar tab mean?

Friday, September 9th, 2011 at 4:48 am

I dont think it’s a bend or anything. Been playing guitar around a year, but never really came across this symbol until now where it always seems to come up. Its like this 10___ but the line starts at the top of the 10, not bellow it, and it is sometimes found in empty places within the tab etc..