Need to hook-up AREF on standalone project ?

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i've allready got little standalone control panel running, controlling 6 outputs , showing txt in 16x2 lcd. (based on atmega 328 chip)
now come idea of controlling backlight in software, , got working program running on uno.
it controls led backligt pwm pin 10.
now when inplement in stand alone project, need hook aref pin vcc , aref gnd pin gnd ?
or needed when reading anlog values ?

thanks (hopefully) upcomming , sorry if dumb question.

avcc (20) +5v.
aref (21) not connected might put 0.1 uf gnd.
agnd (22) gnd.


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