Beating my head against the wall and hoping someone can point out what I'm missing. I have a basic Lightning component with a drop-down. When that drop-down changes, I'd like the controller to make a second field visible through an aura if. But I can't even get the selection onchange to trigger. 

Component is basically:

<aura:attribute name="rType" type="string"/>  
<lightning:select name="rType" label="Record Type" value="{!v.rType}" required="true" onchange="{!c.syncSelection}">

With controller:

syncSelection: function (component, event, helper) {
        console.log("this worked");