Non so da dove hai preso quella descrizione (giochi forse alla 3.0) ma sulla SRD trovi questo.
Weapon and Armor Proficiency
Monks are proficient with club, crossbow (light or heavy), dagger, handaxe, javelin, kama, nunchaku, quarterstaff, sai, shuriken, siangham, and sling.
Monks are not proficient with any armor or shields
When wearing armor, using a shield, or carrying a medium or heavy load, a monk loses her AC bonus, as well as her fast movement and flurry of blows abilities.