  The transverse magnetoresistance of a nodal line Dirac semi-metal InBi has
been studied. It is found that the magnetoresistance is not quadratic. In the
region of small magnetic fields $ B\lesssim 0.1$~T, it is characterized by high
curvature, in the region of medium magnetic fields it is described by the sum
of linear and quadratic contributions, and in the region of large magnetic
fields $ B\gtrsim 1$~T, it approaches a quadratic law with a curvature several
times smaller its zero field value. A phenomenological equation is proposed
that allows to describe the entire dependence of the resistance on the magnetic
field with an error not exceeding the measurement error of several percent.
