I did not know that, neither does my son.
I’m glad to be able to provide the info. It is clear once sentence and/or probation is complete, he is good to vote.
See also:
http://votetexas.gov/faq/registration
Convicted Felons and Voting
In Texas, a convicted felon regains the right to vote after completing his or her sentence. Therefore, once a convict completes the punishment phase (including any term of incarceration, parole, or supervision, or completed a period of probation ordered by the court), the convict is eligible to register and vote in the state of Texas.
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http://www.sos.state.tx.us/elections/pamphlets/largepamp.shtml