New changes to DDOC where is the <u> tag coming from in parent classes?

[Gary Willoughby via Digitalmars-d-learn]

Below is a change that results from re-generating my 
documentation using ddoc. I wonder where the new <u> tags are 
coming from that wrap the parent class name.

-<div class="module-members"><h2><a name="Button"></a>class <span 
class="symbol">Button</span>: tkd.widget.textwidget.TextWidget;
+<div class="module-members"><h2><a name="Button"></a>class <span 
class="symbol">Button</span>: 
<u>tkd.widget.textwidget.TextWidget</u>;

Has there been a new ddoc symbol defined and not mentioned in: 
http://dlang.org/ddoc.html I've redefined most of these in my own 
.ddoc file and can't seem to get rid of the new tag. Is there a 
master ddoc file being read from somewhere?

Any help?