# How does image-automation-controller know which field in a YAML file to update?

Flux CD, Medium (Advanced), Integration. https://k8wiz.com/uquiz/how-does-image-automation-controller-know-which-field-in-a-yaml-file-to-update

- A. A Kustomize images entry that names the ImagePolicy
- B. An annotation fluxcd.io/automated: "true" on the Deployment object
- C. A # {"$imagepolicy": "flux-system:my-app"} comment on that line
- D. Any field named image in the files under the update path

**Answer:** A # {"$imagepolicy": "flux-system:my-app"} comment on that line

**Explanation:** Setters are comments at the end of a line. The plain form updates the full image reference, and :tag or :name update just that part. Only marked fields under the automation's update path change. Flux v1 used the fluxcd.io/automated annotation, which current Flux ignores.