How can a pi_0 meson decay into 2 photons?

[Blue_Angel]

Homework Statement

Earlier my teacher put this equation on the board,
π_0 --> γ+γ
It appears to work until you consider spin.

Homework Equations

a quick google search reveals that the spin of a photon is +1 and the spin of a pi meson is 0

The Attempt at a Solution

This appears to work for momentum, energy, charge, baryon number...
But π_0 has no spin and γ has a spin of +1.
So in essence the atomic spin starts at 0 and finishes at +2.
What am I missing?

 

[mfb]

Two particles with spin 1 don't have to add to spin 2.