R help - Jan 2009 - Multinomial Logit Model

I'm attempting to creat multinomial logistic regression model using the
   following code:



   mlogit<- vglm(ME ~ HIST,family=multinomial(),na.action = na.pass)

   ME (dependent variable) has three levels (0,1,2)



   How do I declare a reference outcome (either 0,1,2)?