Arch linux doesn't know what the volume keys on my keyboard are. so i can xev and pressed the volume up key on my keyboard this is what it gave me

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KeymapNotify event, serial 28, synthetic NO, window 0x0,

keys: 91 0 0 0 16 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

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KeyRelease event, serial 30, synthetic NO, window 0x2400001,

root 0x1df, subw 0x0, time 1549842, (725,-293), root:(3651,276),

state 0x0, keycode 36 (keysym 0xff0d, Return), same_screen YES,

" XLookupString gives 1 bytes: (0d) "

XFilterEvent returns: False

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MappingNotify event, serial 33, synthetic NO, window 0x0,

request MappingKeyboard, first_keycode 8, count 248

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FocusOut event, serial 33, synthetic NO, window 0x2400001,

mode NotifyGrab, detail NotifyAncestor

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FocusIn event, serial 34, synthetic NO, window 0x2400001,

mode NotifyUngrab, detail NotifyAncestor

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KeymapNotify event, serial 34, synthetic NO, window 0x0,

keys: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

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Does anyone know how to fix this problem?