update comment

unit_test/test_nse_net/burn_cell.H

@@ -69,8 +69,10 @@ void burn_cell_c()
  // now test the EOS+NSE function. The basic idea is the following:
  //
  // 1. find the e corresponding to the current NSE state (eos_input_rt)
- // 2. perturb e and then call the NSE EOS to get the updated T
- // 3. call the EOS with this new T (eos_input_rt) and updated NSE
+ // 2. perturb e and then call the NSE EOS to get the updated T and abar
+ // 3. call the NSE function explicitly with the new T to get the X's
+ // (since the NSE EOS doesn't return these).
+ // 4. call the EOS with this new T (eos_input_rt) and updated NSE
  // composition and see if we recover the same perturbed e
 
  eos_t eos_state;