Khergit bow: The favoured weapon of the Khergit raiders. This weapon has a slight recurve which gives it the power and range of a longbow, while still being small enough to be used on horseback. The khergit horse archers make devastating use of this bow on the open steppes, peppering the enemy from afar and then fleeing from direct combat.
Basically it would outline the features of the weapon and explain how it is used in the game world. In any case weapon descriptions would be a nice step towards fleshing the game out some more. I wouldn't limit them to weapons and armour either. Every item could have a description. It would definitely be cool reading about why spices are so valuable, or how warhorses are trained and armoured for combat. There could also be descriptions for troops, explaining "historical" details like where they come from and what equipment and tactics they use. That would certainly help when I'm figuring out which upgrade path to choose.