Generate documentation from PL/pgsql source code?

I maintain large libraries of files containing PL/pgsql code which I would like to document better. Are there any tools currently available that can generate documentation from PL/pgsql source code? Would be good if it had functionality like doxygen. e.g

/**
* my function comment..
*
* @param p_one The table schema
* @param p_two The table name
* @return If function successfully completed
* @throws RAISE_EXCEPTION If something bad happens
*/
CREATE OR REPLACE FUNCTION my_function(
p_one TEXT,
p_two TEXT
)
RETURNS BOOLEAN AS
$$
BEGIN
etc....
END;
$$ LANGUAGE plpgsql;

Cheers
Jeremy

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