They're marked with "T"s above the spots on the tab. Just look at eruption or something for an example.... (I'm laaaazyyyyy!)
Quote by rebelmidget
I do believe you just used Blink 182 and hard rock in the same sentence. It would seem you're rather confused.
I have a quote in my signature! And it makes fun of blink-182! I'm cool now!

[Obligatory link to my band's MySpace]