  We present the photometric data from TESS for two known ZZ Ceti stars, PG
1541+651 and BPM 31594. Before TESS, both objects only had observations from
short runs from ground-based facilities, with three and one period detected,
respectively. The TESS data allowed the detection of multiple periodicities, 12
for PG 1541$+$651, and six for BPM 31594, which enables us to perform a
detailed asteroseismological study. For both objects we found a representative
asteroseismic model with canonical stellar mass ~ 0.61 Msun and thick hydrogen
envelopes, thicker than 10^(-5.3) M_*. The detection of triplets in the Fourier
transform also allowed us to estimate mean rotation periods, being ~22 h for PG
1541+651 and 11.6 h for BPM 31594, which is consistent with range of values
reported for other ZZ Ceti stars.
