geoserver - How to add a title in a GetLegendGraphic Request

The GetLegendGraphic request works well. I display the legend at a fixed position in my viewer using OpenLayers. But I would like to know if there is any way to add some custom text to the legend.

The legend that geoserver produces is like this: http://docs.geoserver.org/latest/en/user/_images/samplelegend.png

But I need to produce a legend with a title: http://minus.com/m4AP102Jj

Does anyone know if the GetLegendGraphic request in GeoServer, or the SLD style have a way to add this?

UPDATE (23/08/12)

For now I´ll use a litle trick to add a title by adding in my SLD another custom rule above all others that not match any other rules:

Example:

  [NAME]
    [TITLE]
    
      

        [PROPERTY_NAME]
        [SOME_VALUE_THAT_NOT_MATCH_OTHER_RULES]
      
    
    
      
        [MATCH_BACKGROUND_COLOR]