Canon EOS-1D X Instruction Manual page 32

Transferring Images Individually
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 quantity to print, for
example. The caption is also added to images stored on the camera.
For instructions on creating and registering captions, see page
100.
You can check the captions added to images in the user comments
included in the Exif information.
32
Take the picture.
1
Select [Communication settings].
2
Select [Network settings].
3
Once [Communication func] is set

to [Enable], you can select [Network
settings].