diff --git a/charts/flagger/README.md b/charts/flagger/README.md
index 20ec706c..48ff06a1 100644
--- a/charts/flagger/README.md
+++ b/charts/flagger/README.md
@@ -177,6 +177,7 @@ The following tables lists the configurable parameters of the Flagger chart and
 | `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`                               |
+| `namespace`                          | When specified, Flagger will restrict itself to watching Canary objects from that namespace                                                                   | `""`                                  |
 
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm upgrade`. For example,