Update docs with new annotation value
@@ -341,6 +341,18 @@ how/where to undo the change (cf [flux#1211](https://github.com/fluxcd/flux/issu
annotation exists in either the cluster or in git, it will be respected, so you may need to remove
it from both places.
+Additionally when garbage collection is enabled. Flux will not garbage collect resources in the cluster
+with the ignore annotation if the resource is removed from git.
+
+### Can I disable garbage collection for a specific resource?
+
+Yes. By adding the annotation below to a resource Flux will sync updates from git, but it will not
+garbage collect when the resource is removed from git.
+
+```yaml
+ fluxcd.io/ignore: sync_only
+```
+
### How can I prevent Flux overriding the replicas when using HPA?
When using a horizontal pod autoscaler you have to remove the `spec.replicas` from your deployment definition.
