Canon EOS-1 DX Mark III Advanced User's Manual page 622

Adding a Caption Before Transfer
You can add a registered caption to each image before transfer. This is convenient if you
want to inform the recipient of the printing quantity, for example. Captions are also added to
images saved to the camera.
You can check captions added to images by examining the Exif information, in the user
comments.
Captions can be created and registered with EOS Utility (
1.
Select [
2.
Select [Transfer with caption].
: Image transfer].
The last image viewed is displayed.
622
) or Browser Remote ( ).