Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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 Correction of Lens Aberrations due to Optical CharacteristicsN
The lens correction data for lens aberration corrections is registered 
(stored) in the camera. With [Enable] selected, the peripheral 
illumination correction, distortion correction, Digital Lens Optimizer, 
chromatic aberration correction, and diffraction correction will be 
applied automatically.
With EOS Utility (EOS software, p.598), you can check which lenses 
have their correction data registered in the camera. You can also 
register the correction data for unregistered lenses. For details, refer to 
the EOS Utility Instruction Manual (p.600).
For lenses incorporating the correction data, it is not necessary to 
register the correction data to the camera.
Lens Correction Data