350 chev very small nick on cylinder wall?

hi all.yesterday i pulled the heads off my 350 chev engine.thought i would check the cylinder walls for damage.i found a very small nick about 1/4 the way down cylinder number 4.is this going to be a problem.cant afford to rebore all cylinder and new pistons etc.motor was rebuilt around 8,000ks ago by last owner.could this be ring damage from before the rebuild that boring didnt totally remove.there has been no loss of compression in that cylinder or signs of oil usage.the nick is very hard to see at first but does catch on fingernail.althought it is not very deep i dont think a hone well fix it.it is the size off 4 0r 5 pin heads.its a pain because now i know its there its going to play on my mind.