Provide depth information for cut in drawing

Hey everybody, I am new to this software so I am sure this is possible and I am just doing it wrong, but I was wondering how to add in a line to indicate during manufacturing how deep to cut a hole.
For example see this drawing below where I would like to indicate the cut depth to be 15mm as overlaid using crude screenshot tools


You can doubleclick on one View, and there should be an Button under the view where you can toggle the visibility of inside geometrie

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