  The properties of quark and gluon jets, and the differences between them, are
increasingly important at the LHC. However, Monte Carlo event generators are
normally tuned to data from $e^+e^-$ collisions which are primarily sensitive
to quark-initiated jets. In order to improve the description of gluon jets we
make improvements to the perturbative and the non-perturbative modelling of
gluon jets and include data with gluon-initiated jets in the tuning for the
first time. The resultant tunes significantly improve the description of gluon
jets and are now the default in Herwig 7.1.
