docs: function (validations) {
  		if (!validations) {
  			return this;
  		}
  
  		if (!this.validations) {
  			this.validations = [];
  		}
  
  		var that = this;
  
  		_.isArray(validations) || (validations = [ validations ]);
  
  		_.each(validations, function (validation) {
  			that.validations.push(validation);
  		});
  
  		return this;
  	}