Question about fix qeq/reax and charge information in data file

Dear Lammps Users,

In the Reax examples, I find that the charge column of all the data files is 0. And in the input files, the command fix qeq/reax is all used. So I am very confused about this. Theoretically, is it necessary to define the charge value of every single atom in order to perform the charge equilibration? Thanks in advance.

Kind Regards,