diff --git a/docs/fluxcd.md b/docs/fluxcd.md
index 05a117b..3bff5ab 100644
--- a/docs/fluxcd.md
+++ b/docs/fluxcd.md
@@ -24,3 +24,21 @@ kubectl create secret generic ${SECRET_NAME} \
 --namespace=${NAMESPACE} \
 --from-file=age.agekey=/dev/stdin
 ```
+
+## kustomization prune
+
+**Disable:**
+
+``` bash
+FLUX_RESOURCE_NAME="???"
+FLUX_RESOURCE_NS="???"
+kubectl patch helmrelease ${FLUX_RESOURCE_NAME} -n ${FLUX_RESOURCE_NS} --type merge -p '{"spec":{"prune":false}}'
+```
+
+**Enable:**
+
+``` bash
+FLUX_RESOURCE_NAME="???"
+FLUX_RESOURCE_NS="???"
+kubectl patch helmrelease ${FLUX_RESOURCE_NAME} -n ${FLUX_RESOURCE_NS} --type merge -p '{"spec":{"prune":true}}'
+```