Can weight_decay in AdamW be greater than zero?

I just learned that it is possible to set weight_decay in AdamW to a value greater than 1. I thought that weight decay must be between 0 and 1, or am I missing something?

def make_optimizer(model, decoder_weight_decay):
    groups = []
    for n, p in model.named_parameters():
            if n.startswith('decoder.weight'):
                weight_decay = decoder_weight_decay
            group = {
                "params": p,
                "weight_decay": weight_decay,
                "name": n}
    return AdamW(groups)