Sistering Floor Joist!

I have a approx. 12-15' portion of 2x10 that has a crack in it. I do not see any noticeable difference in the floor above so I am not certain I even need to tend to this? If I do, judging by the picture, is it as easy as sistering a new 2x10 next to the cracked joist and joining them with carriage bolts? Do you feel I need to jack up this portion? I would appreciate any advice here? Thank you.