diff --git a/pkg/apis/flagger/v1beta1/canary.go b/pkg/apis/flagger/v1beta1/canary.go
index 04597da7d..54ae27061 100644
--- a/pkg/apis/flagger/v1beta1/canary.go
+++ b/pkg/apis/flagger/v1beta1/canary.go
@@ -396,6 +396,7 @@ type CanaryWebhook struct {
 	Metadata *map[string]string `json:"metadata,omitempty"`
 
 	// Number of retries for this webhook
+	// +optional
 	Retries int `json:"retries,omitempty"`
 }