dataList displaying horizontal

[Gregg Bolinger]

I created a dataList

<t:dataList var="category" value="#{CategoryAdminBean.categories}" layout="simple">
   <t:commandLink action="" >
      <t:outputText value="#{ category.categoryName}"/>
   </t:commandLink>
</t:dataList>

I thought the "simple" layout was supposed to be

Cat1
Cat2
Cat3
...

But it is appearing as:

Cat1 Cat2 Cat3

Should this be happening?

Thanks.