  The updated H-band spectral line list (from \lambda 15,000 - 17,000\AA)
adopted by the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
for the SDSS IV Data Release 16 (DR16) is presented here. The APOGEE line list
is a combination of atomic and molecular lines with data from laboratory,
theoretical, and astrophysical sources. Oscillator strengths and damping
constants are adjusted using high signal-to-noise, high-resolution spectra of
the Sun and alpha Boo (Arcturus) as "standard stars". Updates to the DR16 line
list, when compared to the previous DR14 version, are the inclusion of
molecular H_2O and FeH lines, as well as a much larger (by a factor of ~4)
atomic line list, which includes significantly more transitions with hyperfine
splitting. More recent references and line lists for the crucial molecules CO
and OH were used, as well as for C_2 and SiH. In contrast to DR14, DR16
contains measurable lines from the heavy neutron-capture elements cerium (as Ce
II), neodymium (as Nd II), and ytterbium (as Yb II), as well as one line from
rubidium (as Rb I), that may be detectable in a small fraction of APOGEE red
giants.
