From Q Magazine- October 02, 2004

One Step Closer

Bono ponders the meaning of death over a hushed backdrop. Bono: "Noel Gallagher gave me that line. We were in Birmingham on the last U.K. tour. I was telling Noel my old man had lost his faith and didn't know where he was going. And Noel just said (adopts passable Mancunian drawl), 'Well he's one step closer to knowing, isn't he?' "
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But the thing is, I had read other places that Noel was helping Bono write the song, like here:

Southlondon.co.uk

BONO has revealed that Noel Gallagher is helping him write a song in memory of his dad.

The singer's father Bob Hewson died from cancer in August aged 75.

The track is called One Step Closer To Knowing, reports the Sun.

Earlier this year Bono paid an emotional tribute to Bob when U2 played at Earl's Court, shortly after his death.
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So, if Noel helped Bono write it, shouldn't he be credited with co-writing the lyrics, instead of just Bono? It seems odd that he would just get a "special thanks."