How to use NODELET_DEBUG()

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Probably this is a stupid question, but I couldn't the answer in google or the ros wiki information about nodelets.

I'm using a launch file to launch a nodelet (in fact I've been using different nodelets) which is using NODELET_DEBUG(...) and NODELET_INFO(...) to output information. But in the console I only see the INFO output.

In http://www.ros.org/wiki/nodelet they say that "They also have the advantage that you can turn one specific nodelet into debug, instead of all nodelets of a specific type".

How can I see the DEBUG output? Is there a way to configure it in the launch file?

Thanks in advance