Retirement tax questions

Thank you for your help. I have another question. In box 13 "retirement plan" is checked however there isn't any information within the 12 a;b;c;d description section providing the contributed dollar amount. Should there be a description/ $ value? As it stands we are now paying taxes on his income since the Fed tax withheld is not enough for the box 1 income; which from my calculations doesn't account for the TRS contributions.