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
currentlyavailable that can generate documentation from PL/pgsql source code? Would be good if it had functionality
likedoxygen. 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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