Rule 6-4: Caddie

A “caddie” is one who assists the player in accordance with the Rules, which may include carrying or handling the player's clubs during play. When one caddie is employed by more than one player, he is always deemed to be the caddie of the player whose ball is involved, and equipment carried by him is deemed to be that player's equipment, except when the caddie acts upon specific directions of another player, in which case he is considered to be that other player's caddie.

The player may be assisted by a caddie, but he is limited to only one caddie at any one time.