diff --git a/charts/flagger/README.md b/charts/flagger/README.md
index 209be8bc6..a186206a3 100644
--- a/charts/flagger/README.md
+++ b/charts/flagger/README.md
@@ -179,6 +179,8 @@ The following tables lists the configurable parameters of the Flagger chart and
 | `podPriorityClassName`             | PriorityClass name for pod priority configuration                                                                                                  | ""                                    |
 | `podDisruptionBudget.enabled`      | A PodDisruptionBudget will be created if `true`                                                                                                    | `false`                               |
 | `podDisruptionBudget.minAvailable` | The minimal number of available replicas that will be set in the PodDisruptionBudget                                                               | `1`                                   |
+| `podDisruptionBudget.minAvailable` | The minimal number of available replicas that will be set in the PodDisruptionBudget                                                               | `1`                                   |
+| `noCrossNamespaceRefs`             | If `true`, cross namespace references to custom resources will be disabled.                                                                        | `false`                               |
 
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm upgrade`. For example,
 
diff --git a/charts/flagger/templates/deployment.yaml b/charts/flagger/templates/deployment.yaml
index 0418c0119..a854be46b 100644
--- a/charts/flagger/templates/deployment.yaml
+++ b/charts/flagger/templates/deployment.yaml
@@ -141,6 +141,9 @@ spec:
           {{- if .Values.clusterName }}
           - -cluster-name={{ .Values.clusterName }}
           {{- end }}
+          {{- if .Values.noCrossNamespaceRefs }}
+          - -no-cross-namespace-refs={{ .Values.noCrossNamespaceRefs }}
+          {{- end }}
           livenessProbe:
             exec:
               command:
diff --git a/charts/flagger/values.yaml b/charts/flagger/values.yaml
index f83480df0..30b5693c6 100644
--- a/charts/flagger/values.yaml
+++ b/charts/flagger/values.yaml
@@ -165,3 +165,5 @@ podDisruptionBudget:
   minAvailable: 1
 
 podLabels: {}
+
+noCrossNamespaceRefs: false
diff --git a/docs/gitbook/faq.md b/docs/gitbook/faq.md
index e5983df2d..67879e900 100644
--- a/docs/gitbook/faq.md
+++ b/docs/gitbook/faq.md
@@ -72,6 +72,17 @@ A window of downtime is the intended behavior when the analysis is disabled. Thi
 a Kubernetes deployment initialization works. To avoid this, enable the analysis (`skipAnalysis: true`), wait for the initialization
 to finish, and disable it afterward (`skipAnalysis: false`).
 
+#### How to disable cross namespace references?
+
+Flagger by default can access resources across namespaces (`AlertProivder` and `MetricProvider`). If you're in a multi-tenant enviornemnt
+and wish to disable this, you can do so through the `no-cross-namespace-refs` flag.
+
+```
+flagger \
+  -no-cross-namespace-refs=true \
+  ...
+```
+
 ## Kubernetes services
 
 #### How is an application exposed inside the cluster?