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The accretion of relativistic and non-relativistic fluids into aReissner-Nordstr\"om black hole is revisited. The position of the criticalpoint, the flow velocity at this point and the accretion rate are only slightlyaffected with respect to the Schwarzschild case when the fluid isnon-relativistic. On the contrary, relativistic fluids cross the critical pointalways subsonically. In this case, the sonic point is located near the eventhorizon, which is crossed by the fluid with a velocity less than the lightspeed. The accretion rate of relativistic fluids by a Reissner-Nordstr\"omblack hole is reduced with respect to those estimated for uncharged blackholes, being about 60% less for the extreme case (charge-to-mass ratio equal toone).

Relativistic Accretion into a Reissner-Nordstr\"om Black Hole Revisited