Specified the energy is in the comoving frame.

docs/physics/tardisgamma/packetinitialization.rst

@@ -2,7 +2,7 @@ Packet Initialization
 =====================
 
 The gamma ray portion of TARDIS also uses the idea of packets of photons from :cite:`Abbott1985` and :cite:`Lucy1999` (see :doc:`../montecarlo/initialization`)
-These packets are given an energy equal to the total energy divided by the number of packets and a frequency that is equal to the packet energy divided by Planck's constant, h.
+These packets are given an energy in the comoving frame which is equal to the total energy divided by the number of packets. They are also given a  frequency that is equal to the packet energy divided by Planck's constant, h.
 
 The packets are also given a direction made up of two angles, :math:`\theta` and :math:`\phi`, where  :math:`\theta` is a polar angle between 0 and :math:`\pi` and :math:`\phi` is an azimuth angle between 0 and :math:`2\pi`.
 We sample these angles using the following equations :cite:`Carter1975`: