How to add range's weapon 's damage?

[demigame]

When we use a long-sword (melee weapon), it's damage type is:

damage : 1-8 (criticial 19-20*2)

and if we have STR 30 (for example), it will become :

damage :1-8 + 10 (criticial 19-20*2)

-------------- But when use range weapon , for example a long-bow

damage: 1-8 (criticial 20*3)

i increate DEX but it does'nt increase range weapon's damage. even i wear a light armor which has no penality.

so , does anyone know how to increase range weapon's damage ?

[Xandax]

A bows damage doesn't increase with dex (or strength like a melee weapon.)

Damage can increase with strength if you get a bow with the "Mighty" attribute which allows a portion of your strength modifier to be added to the damage.
Or you'll need to find Bows which have bonus modifiers to damage for it to increase. (Bow +2 for example)