On my laptops keyboard (QWERTY) there are some ridges on the F and J buttons, what are they for?

Resolved Question

They don't bother me, I'm just interested! they are little ridges towards the bottom of the button, and they interest me :P


Thanks in advance :)
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Best Answer
 
People who touch-type (type without looking) use these two ridges to determine the position of their fingers on the keyboard. Touch typists put the index finger of their left hand on F and the index finger of their right hand on J before they type so they know where their fingers are at.
 
source: Yahoo.com