CONTEXT on PL/pgSQL

I have a simple function made with PL/pgSQL and when I call it I get this in
the logs:

2004-04-23 10:15:32 [30669] LOG: statement: SELECT nodoSuperior(22) AS sup
2004-04-23 10:15:32 [30669] LOG: statement: SELECT $1
CONTEXT: PL/pgSQL function "nodosuperior" line 7 at assignment
2004-04-23 10:15:32 [30669] LOG: statement: SELECT codigo,padre,nombre FROM
procesos WHERE codigo= $1
CONTEXT: PL/pgSQL function "nodosuperior" line 10 at select into variables
2004-04-23 10:15:32 [30669] LOG: statement: SELECT $1 IS NULL
CONTEXT: PL/pgSQL function "nodosuperior" line 12 at exit
2004-04-23 10:15:32 [30669] LOG: statement: SELECT $1
CONTEXT: PL/pgSQL function "nodosuperior" line 16 at return

What does CONTEXT mean, and is everything ok?

The function is this:

CREATE OR REPLACE FUNCTION nodoSuperior(INT) RETURNS VARCHAR AS '
DECLARE
COD INT;
SUP RECORD;

BEGIN

COD:=$1;

LOOP
SELECT INTO SUP codigo,padre,nombre
FROM procesos WHERE codigo=COD;
EXIT WHEN SUP.padre IS NULL;
COD:=SUP.padre;
END LOOP;

RETURN SUP.nombre;
END;
' LANGUAGE 'plpgsql';

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