How to enter Headstone info for more than one name?

When I add a photo of a headstone, I could tag it as a 'headstone' and the name, birth, death ... fields pops up. That is fine if there is just one name on the headstone. What is the single headstone is shared by both husband and wife? How could I add the information for the other spouse?

I could post the same picture again, but seems more logical to tag both persons to the same headstone. Any suggestions? Thanks!