How to use a non-standard DDoc section?

[Max Samukha]

In the following example, the custom section header and contents are
rendered as part of foo's descrition. I have not been able to persuade
DDoc to make it a new section. Anybody knows how to do that?

/**
    Params:
	foo     = bar

$(DDOC_SECTION_H Section header:)
$(DDOC_SECTION Section contents)
*/