Edit your PDFs in linux

here i'm again... this time with something for linux lovers...
i had been searching for a software in linux which i could use to edit(highlight, underline) my pdf's.
i found a software 'xournal' which could do this for you. its actually a image editing software, and basically it is used for notetaking, but annotating a pdf becomes a side feature...

finally i found a software in linux which could do highlighting for me...

cheers!!!